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Commit | Line | Data |
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48925e37 | 1 | /* A network driver using virtio. |
296f96fc RR |
2 | * |
3 | * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
adf8d3ff | 16 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
296f96fc RR |
17 | */ |
18 | //#define DEBUG | |
19 | #include <linux/netdevice.h> | |
20 | #include <linux/etherdevice.h> | |
a9ea3fc6 | 21 | #include <linux/ethtool.h> |
296f96fc RR |
22 | #include <linux/module.h> |
23 | #include <linux/virtio.h> | |
24 | #include <linux/virtio_net.h> | |
f600b690 | 25 | #include <linux/bpf.h> |
296f96fc | 26 | #include <linux/scatterlist.h> |
e918085a | 27 | #include <linux/if_vlan.h> |
5a0e3ad6 | 28 | #include <linux/slab.h> |
8de4b2f3 | 29 | #include <linux/cpu.h> |
ab7db917 | 30 | #include <linux/average.h> |
91815639 | 31 | #include <net/busy_poll.h> |
296f96fc | 32 | |
d34710e3 | 33 | static int napi_weight = NAPI_POLL_WEIGHT; |
6c0cd7c0 DL |
34 | module_param(napi_weight, int, 0444); |
35 | ||
eb939922 | 36 | static bool csum = true, gso = true; |
34a48579 RR |
37 | module_param(csum, bool, 0444); |
38 | module_param(gso, bool, 0444); | |
39 | ||
296f96fc | 40 | /* FIXME: MTU in config. */ |
5061de36 | 41 | #define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) |
3f2c31d9 | 42 | #define GOOD_COPY_LEN 128 |
296f96fc | 43 | |
5377d758 JB |
44 | /* RX packet size EWMA. The average packet size is used to determine the packet |
45 | * buffer size when refilling RX rings. As the entire RX ring may be refilled | |
46 | * at once, the weight is chosen so that the EWMA will be insensitive to short- | |
47 | * term, transient changes in packet size. | |
ab7db917 | 48 | */ |
5377d758 | 49 | DECLARE_EWMA(pkt_len, 1, 64) |
ab7db917 MD |
50 | |
51 | /* Minimum alignment for mergeable packet buffers. */ | |
52 | #define MERGEABLE_BUFFER_ALIGN max(L1_CACHE_BYTES, 256) | |
53 | ||
66846048 | 54 | #define VIRTNET_DRIVER_VERSION "1.0.0" |
2a41f71d | 55 | |
3fa2a1df | 56 | struct virtnet_stats { |
83a27052 ED |
57 | struct u64_stats_sync tx_syncp; |
58 | struct u64_stats_sync rx_syncp; | |
3fa2a1df | 59 | u64 tx_bytes; |
60 | u64 tx_packets; | |
61 | ||
62 | u64 rx_bytes; | |
63 | u64 rx_packets; | |
64 | }; | |
65 | ||
e9d7417b JW |
66 | /* Internal representation of a send virtqueue */ |
67 | struct send_queue { | |
68 | /* Virtqueue associated with this send _queue */ | |
69 | struct virtqueue *vq; | |
70 | ||
71 | /* TX: fragments + linear part + virtio header */ | |
72 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
986a4f4d JW |
73 | |
74 | /* Name of the send queue: output.$index */ | |
75 | char name[40]; | |
e9d7417b JW |
76 | }; |
77 | ||
78 | /* Internal representation of a receive virtqueue */ | |
79 | struct receive_queue { | |
80 | /* Virtqueue associated with this receive_queue */ | |
81 | struct virtqueue *vq; | |
82 | ||
296f96fc RR |
83 | struct napi_struct napi; |
84 | ||
f600b690 JF |
85 | struct bpf_prog __rcu *xdp_prog; |
86 | ||
e9d7417b JW |
87 | /* Chain pages by the private ptr. */ |
88 | struct page *pages; | |
89 | ||
ab7db917 | 90 | /* Average packet length for mergeable receive buffers. */ |
5377d758 | 91 | struct ewma_pkt_len mrg_avg_pkt_len; |
ab7db917 | 92 | |
fb51879d MD |
93 | /* Page frag for packet buffer allocation. */ |
94 | struct page_frag alloc_frag; | |
95 | ||
e9d7417b JW |
96 | /* RX: fragments + linear part + virtio header */ |
97 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
986a4f4d JW |
98 | |
99 | /* Name of this receive queue: input.$index */ | |
100 | char name[40]; | |
e9d7417b JW |
101 | }; |
102 | ||
103 | struct virtnet_info { | |
104 | struct virtio_device *vdev; | |
105 | struct virtqueue *cvq; | |
106 | struct net_device *dev; | |
986a4f4d JW |
107 | struct send_queue *sq; |
108 | struct receive_queue *rq; | |
e9d7417b JW |
109 | unsigned int status; |
110 | ||
986a4f4d JW |
111 | /* Max # of queue pairs supported by the device */ |
112 | u16 max_queue_pairs; | |
113 | ||
114 | /* # of queue pairs currently used by the driver */ | |
115 | u16 curr_queue_pairs; | |
116 | ||
672aafd5 JF |
117 | /* # of XDP queue pairs currently used by the driver */ |
118 | u16 xdp_queue_pairs; | |
119 | ||
97402b96 HX |
120 | /* I like... big packets and I cannot lie! */ |
121 | bool big_packets; | |
122 | ||
3f2c31d9 MM |
123 | /* Host will merge rx buffers for big packets (shake it! shake it!) */ |
124 | bool mergeable_rx_bufs; | |
125 | ||
986a4f4d JW |
126 | /* Has control virtqueue */ |
127 | bool has_cvq; | |
128 | ||
e7428e95 MT |
129 | /* Host can handle any s/g split between our header and packet data */ |
130 | bool any_header_sg; | |
131 | ||
012873d0 MT |
132 | /* Packet virtio header size */ |
133 | u8 hdr_len; | |
134 | ||
3fa2a1df | 135 | /* Active statistics */ |
136 | struct virtnet_stats __percpu *stats; | |
137 | ||
3161e453 RR |
138 | /* Work struct for refilling if we run low on memory. */ |
139 | struct delayed_work refill; | |
140 | ||
586d17c5 JW |
141 | /* Work struct for config space updates */ |
142 | struct work_struct config_work; | |
143 | ||
986a4f4d JW |
144 | /* Does the affinity hint is set for virtqueues? */ |
145 | bool affinity_hint_set; | |
47be2479 | 146 | |
8017c279 SAS |
147 | /* CPU hotplug instances for online & dead */ |
148 | struct hlist_node node; | |
149 | struct hlist_node node_dead; | |
2ac46030 MT |
150 | |
151 | /* Control VQ buffers: protected by the rtnl lock */ | |
152 | struct virtio_net_ctrl_hdr ctrl_hdr; | |
153 | virtio_net_ctrl_ack ctrl_status; | |
a725ee3e | 154 | struct virtio_net_ctrl_mq ctrl_mq; |
2ac46030 MT |
155 | u8 ctrl_promisc; |
156 | u8 ctrl_allmulti; | |
a725ee3e | 157 | u16 ctrl_vid; |
16032be5 NA |
158 | |
159 | /* Ethtool settings */ | |
160 | u8 duplex; | |
161 | u32 speed; | |
296f96fc RR |
162 | }; |
163 | ||
9ab86bbc | 164 | struct padded_vnet_hdr { |
012873d0 | 165 | struct virtio_net_hdr_mrg_rxbuf hdr; |
9ab86bbc | 166 | /* |
012873d0 MT |
167 | * hdr is in a separate sg buffer, and data sg buffer shares same page |
168 | * with this header sg. This padding makes next sg 16 byte aligned | |
169 | * after the header. | |
9ab86bbc | 170 | */ |
012873d0 | 171 | char padding[4]; |
9ab86bbc SM |
172 | }; |
173 | ||
986a4f4d JW |
174 | /* Converting between virtqueue no. and kernel tx/rx queue no. |
175 | * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq | |
176 | */ | |
177 | static int vq2txq(struct virtqueue *vq) | |
178 | { | |
9d0ca6ed | 179 | return (vq->index - 1) / 2; |
986a4f4d JW |
180 | } |
181 | ||
182 | static int txq2vq(int txq) | |
183 | { | |
184 | return txq * 2 + 1; | |
185 | } | |
186 | ||
187 | static int vq2rxq(struct virtqueue *vq) | |
188 | { | |
9d0ca6ed | 189 | return vq->index / 2; |
986a4f4d JW |
190 | } |
191 | ||
192 | static int rxq2vq(int rxq) | |
193 | { | |
194 | return rxq * 2; | |
195 | } | |
196 | ||
012873d0 | 197 | static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb) |
296f96fc | 198 | { |
012873d0 | 199 | return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb; |
296f96fc RR |
200 | } |
201 | ||
9ab86bbc SM |
202 | /* |
203 | * private is used to chain pages for big packets, put the whole | |
204 | * most recent used list in the beginning for reuse | |
205 | */ | |
e9d7417b | 206 | static void give_pages(struct receive_queue *rq, struct page *page) |
0a888fd1 | 207 | { |
9ab86bbc | 208 | struct page *end; |
0a888fd1 | 209 | |
e9d7417b | 210 | /* Find end of list, sew whole thing into vi->rq.pages. */ |
9ab86bbc | 211 | for (end = page; end->private; end = (struct page *)end->private); |
e9d7417b JW |
212 | end->private = (unsigned long)rq->pages; |
213 | rq->pages = page; | |
0a888fd1 MM |
214 | } |
215 | ||
e9d7417b | 216 | static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) |
fb6813f4 | 217 | { |
e9d7417b | 218 | struct page *p = rq->pages; |
fb6813f4 | 219 | |
9ab86bbc | 220 | if (p) { |
e9d7417b | 221 | rq->pages = (struct page *)p->private; |
9ab86bbc SM |
222 | /* clear private here, it is used to chain pages */ |
223 | p->private = 0; | |
224 | } else | |
fb6813f4 RR |
225 | p = alloc_page(gfp_mask); |
226 | return p; | |
227 | } | |
228 | ||
e9d7417b | 229 | static void skb_xmit_done(struct virtqueue *vq) |
296f96fc | 230 | { |
e9d7417b | 231 | struct virtnet_info *vi = vq->vdev->priv; |
296f96fc | 232 | |
2cb9c6ba | 233 | /* Suppress further interrupts. */ |
e9d7417b | 234 | virtqueue_disable_cb(vq); |
11a3a154 | 235 | |
363f1514 | 236 | /* We were probably waiting for more output buffers. */ |
986a4f4d | 237 | netif_wake_subqueue(vi->dev, vq2txq(vq)); |
296f96fc RR |
238 | } |
239 | ||
ab7db917 MD |
240 | static unsigned int mergeable_ctx_to_buf_truesize(unsigned long mrg_ctx) |
241 | { | |
242 | unsigned int truesize = mrg_ctx & (MERGEABLE_BUFFER_ALIGN - 1); | |
243 | return (truesize + 1) * MERGEABLE_BUFFER_ALIGN; | |
244 | } | |
245 | ||
246 | static void *mergeable_ctx_to_buf_address(unsigned long mrg_ctx) | |
247 | { | |
248 | return (void *)(mrg_ctx & -MERGEABLE_BUFFER_ALIGN); | |
249 | ||
250 | } | |
251 | ||
252 | static unsigned long mergeable_buf_to_ctx(void *buf, unsigned int truesize) | |
253 | { | |
254 | unsigned int size = truesize / MERGEABLE_BUFFER_ALIGN; | |
255 | return (unsigned long)buf | (size - 1); | |
256 | } | |
257 | ||
3464645a | 258 | /* Called from bottom half context */ |
946fa564 MT |
259 | static struct sk_buff *page_to_skb(struct virtnet_info *vi, |
260 | struct receive_queue *rq, | |
2613af0e MD |
261 | struct page *page, unsigned int offset, |
262 | unsigned int len, unsigned int truesize) | |
9ab86bbc SM |
263 | { |
264 | struct sk_buff *skb; | |
012873d0 | 265 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
2613af0e | 266 | unsigned int copy, hdr_len, hdr_padded_len; |
9ab86bbc | 267 | char *p; |
fb6813f4 | 268 | |
2613af0e | 269 | p = page_address(page) + offset; |
3f2c31d9 | 270 | |
9ab86bbc | 271 | /* copy small packet so we can reuse these pages for small data */ |
c67f5db8 | 272 | skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN); |
9ab86bbc SM |
273 | if (unlikely(!skb)) |
274 | return NULL; | |
3f2c31d9 | 275 | |
9ab86bbc | 276 | hdr = skb_vnet_hdr(skb); |
3f2c31d9 | 277 | |
012873d0 MT |
278 | hdr_len = vi->hdr_len; |
279 | if (vi->mergeable_rx_bufs) | |
280 | hdr_padded_len = sizeof *hdr; | |
281 | else | |
2613af0e | 282 | hdr_padded_len = sizeof(struct padded_vnet_hdr); |
3f2c31d9 | 283 | |
9ab86bbc | 284 | memcpy(hdr, p, hdr_len); |
3f2c31d9 | 285 | |
9ab86bbc | 286 | len -= hdr_len; |
2613af0e MD |
287 | offset += hdr_padded_len; |
288 | p += hdr_padded_len; | |
3f2c31d9 | 289 | |
9ab86bbc SM |
290 | copy = len; |
291 | if (copy > skb_tailroom(skb)) | |
292 | copy = skb_tailroom(skb); | |
293 | memcpy(skb_put(skb, copy), p, copy); | |
3f2c31d9 | 294 | |
9ab86bbc SM |
295 | len -= copy; |
296 | offset += copy; | |
3f2c31d9 | 297 | |
2613af0e MD |
298 | if (vi->mergeable_rx_bufs) { |
299 | if (len) | |
300 | skb_add_rx_frag(skb, 0, page, offset, len, truesize); | |
301 | else | |
302 | put_page(page); | |
303 | return skb; | |
304 | } | |
305 | ||
e878d78b SL |
306 | /* |
307 | * Verify that we can indeed put this data into a skb. | |
308 | * This is here to handle cases when the device erroneously | |
309 | * tries to receive more than is possible. This is usually | |
310 | * the case of a broken device. | |
311 | */ | |
312 | if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { | |
be443899 | 313 | net_dbg_ratelimited("%s: too much data\n", skb->dev->name); |
e878d78b SL |
314 | dev_kfree_skb(skb); |
315 | return NULL; | |
316 | } | |
2613af0e | 317 | BUG_ON(offset >= PAGE_SIZE); |
9ab86bbc | 318 | while (len) { |
2613af0e MD |
319 | unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len); |
320 | skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset, | |
321 | frag_size, truesize); | |
322 | len -= frag_size; | |
9ab86bbc SM |
323 | page = (struct page *)page->private; |
324 | offset = 0; | |
325 | } | |
3f2c31d9 | 326 | |
9ab86bbc | 327 | if (page) |
e9d7417b | 328 | give_pages(rq, page); |
3f2c31d9 | 329 | |
9ab86bbc SM |
330 | return skb; |
331 | } | |
3f2c31d9 | 332 | |
56434a01 JF |
333 | static void virtnet_xdp_xmit(struct virtnet_info *vi, |
334 | struct receive_queue *rq, | |
335 | struct send_queue *sq, | |
bb91accf JW |
336 | struct xdp_buff *xdp, |
337 | void *data) | |
56434a01 | 338 | { |
56434a01 JF |
339 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
340 | unsigned int num_sg, len; | |
341 | void *xdp_sent; | |
342 | int err; | |
343 | ||
344 | /* Free up any pending old buffers before queueing new ones. */ | |
345 | while ((xdp_sent = virtqueue_get_buf(sq->vq, &len)) != NULL) { | |
bb91accf JW |
346 | if (vi->mergeable_rx_bufs) { |
347 | struct page *sent_page = virt_to_head_page(xdp_sent); | |
348 | ||
349 | put_page(sent_page); | |
350 | } else { /* small buffer */ | |
351 | struct sk_buff *skb = xdp_sent; | |
56434a01 | 352 | |
bb91accf JW |
353 | kfree_skb(skb); |
354 | } | |
355 | } | |
56434a01 | 356 | |
bb91accf JW |
357 | if (vi->mergeable_rx_bufs) { |
358 | /* Zero header and leave csum up to XDP layers */ | |
359 | hdr = xdp->data; | |
360 | memset(hdr, 0, vi->hdr_len); | |
361 | ||
362 | num_sg = 1; | |
363 | sg_init_one(sq->sg, xdp->data, xdp->data_end - xdp->data); | |
364 | } else { /* small buffer */ | |
365 | struct sk_buff *skb = data; | |
366 | ||
367 | /* Zero header and leave csum up to XDP layers */ | |
368 | hdr = skb_vnet_hdr(skb); | |
369 | memset(hdr, 0, vi->hdr_len); | |
370 | ||
371 | num_sg = 2; | |
372 | sg_init_table(sq->sg, 2); | |
373 | sg_set_buf(sq->sg, hdr, vi->hdr_len); | |
374 | skb_to_sgvec(skb, sq->sg + 1, 0, skb->len); | |
375 | } | |
56434a01 | 376 | err = virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, |
bb91accf | 377 | data, GFP_ATOMIC); |
56434a01 | 378 | if (unlikely(err)) { |
bb91accf JW |
379 | if (vi->mergeable_rx_bufs) { |
380 | struct page *page = virt_to_head_page(xdp->data); | |
381 | ||
382 | put_page(page); | |
383 | } else /* small buffer */ | |
384 | kfree_skb(data); | |
56434a01 | 385 | return; // On error abort to avoid unnecessary kick |
56434a01 JF |
386 | } |
387 | ||
388 | virtqueue_kick(sq->vq); | |
389 | } | |
390 | ||
f600b690 | 391 | static u32 do_xdp_prog(struct virtnet_info *vi, |
56434a01 | 392 | struct receive_queue *rq, |
f600b690 | 393 | struct bpf_prog *xdp_prog, |
bb91accf | 394 | void *data, int len) |
f600b690 JF |
395 | { |
396 | int hdr_padded_len; | |
397 | struct xdp_buff xdp; | |
bb91accf | 398 | void *buf; |
56434a01 | 399 | unsigned int qp; |
f600b690 | 400 | u32 act; |
f600b690 | 401 | |
bb91accf | 402 | if (vi->mergeable_rx_bufs) { |
f600b690 | 403 | hdr_padded_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); |
bb91accf JW |
404 | xdp.data = data + hdr_padded_len; |
405 | xdp.data_end = xdp.data + (len - vi->hdr_len); | |
406 | buf = data; | |
407 | } else { /* small buffers */ | |
408 | struct sk_buff *skb = data; | |
409 | ||
410 | xdp.data = skb->data; | |
411 | xdp.data_end = xdp.data + len; | |
412 | buf = skb->data; | |
413 | } | |
f600b690 JF |
414 | |
415 | act = bpf_prog_run_xdp(xdp_prog, &xdp); | |
416 | switch (act) { | |
417 | case XDP_PASS: | |
418 | return XDP_PASS; | |
56434a01 JF |
419 | case XDP_TX: |
420 | qp = vi->curr_queue_pairs - | |
421 | vi->xdp_queue_pairs + | |
422 | smp_processor_id(); | |
bb91accf JW |
423 | xdp.data = buf; |
424 | virtnet_xdp_xmit(vi, rq, &vi->sq[qp], &xdp, data); | |
56434a01 | 425 | return XDP_TX; |
f600b690 JF |
426 | default: |
427 | bpf_warn_invalid_xdp_action(act); | |
f600b690 JF |
428 | case XDP_ABORTED: |
429 | case XDP_DROP: | |
430 | return XDP_DROP; | |
431 | } | |
432 | } | |
433 | ||
bb91accf JW |
434 | static struct sk_buff *receive_small(struct net_device *dev, |
435 | struct virtnet_info *vi, | |
436 | struct receive_queue *rq, | |
437 | void *buf, unsigned int len) | |
f121159d MT |
438 | { |
439 | struct sk_buff * skb = buf; | |
bb91accf | 440 | struct bpf_prog *xdp_prog; |
f121159d | 441 | |
012873d0 | 442 | len -= vi->hdr_len; |
f121159d MT |
443 | skb_trim(skb, len); |
444 | ||
bb91accf JW |
445 | rcu_read_lock(); |
446 | xdp_prog = rcu_dereference(rq->xdp_prog); | |
447 | if (xdp_prog) { | |
448 | struct virtio_net_hdr_mrg_rxbuf *hdr = buf; | |
449 | u32 act; | |
450 | ||
451 | if (unlikely(hdr->hdr.gso_type || hdr->hdr.flags)) | |
452 | goto err_xdp; | |
453 | act = do_xdp_prog(vi, rq, xdp_prog, skb, len); | |
454 | switch (act) { | |
455 | case XDP_PASS: | |
456 | break; | |
457 | case XDP_TX: | |
458 | rcu_read_unlock(); | |
459 | goto xdp_xmit; | |
460 | case XDP_DROP: | |
461 | default: | |
462 | goto err_xdp; | |
463 | } | |
464 | } | |
465 | rcu_read_unlock(); | |
466 | ||
f121159d | 467 | return skb; |
bb91accf JW |
468 | |
469 | err_xdp: | |
470 | rcu_read_unlock(); | |
471 | dev->stats.rx_dropped++; | |
472 | kfree_skb(skb); | |
473 | xdp_xmit: | |
474 | return NULL; | |
f121159d MT |
475 | } |
476 | ||
477 | static struct sk_buff *receive_big(struct net_device *dev, | |
946fa564 | 478 | struct virtnet_info *vi, |
f121159d MT |
479 | struct receive_queue *rq, |
480 | void *buf, | |
481 | unsigned int len) | |
482 | { | |
483 | struct page *page = buf; | |
c47a43d3 | 484 | struct sk_buff *skb = page_to_skb(vi, rq, page, 0, len, PAGE_SIZE); |
f600b690 | 485 | |
f121159d MT |
486 | if (unlikely(!skb)) |
487 | goto err; | |
488 | ||
489 | return skb; | |
490 | ||
491 | err: | |
492 | dev->stats.rx_dropped++; | |
493 | give_pages(rq, page); | |
494 | return NULL; | |
495 | } | |
496 | ||
72979a6c JF |
497 | /* The conditions to enable XDP should preclude the underlying device from |
498 | * sending packets across multiple buffers (num_buf > 1). However per spec | |
499 | * it does not appear to be illegal to do so but rather just against convention. | |
500 | * So in order to avoid making a system unresponsive the packets are pushed | |
501 | * into a page and the XDP program is run. This will be extremely slow and we | |
502 | * push a warning to the user to fix this as soon as possible. Fixing this may | |
503 | * require resolving the underlying hardware to determine why multiple buffers | |
504 | * are being received or simply loading the XDP program in the ingress stack | |
505 | * after the skb is built because there is no advantage to running it here | |
506 | * anymore. | |
507 | */ | |
508 | static struct page *xdp_linearize_page(struct receive_queue *rq, | |
56a86f84 | 509 | u16 *num_buf, |
72979a6c JF |
510 | struct page *p, |
511 | int offset, | |
512 | unsigned int *len) | |
513 | { | |
514 | struct page *page = alloc_page(GFP_ATOMIC); | |
515 | unsigned int page_off = 0; | |
516 | ||
517 | if (!page) | |
518 | return NULL; | |
519 | ||
520 | memcpy(page_address(page) + page_off, page_address(p) + offset, *len); | |
521 | page_off += *len; | |
522 | ||
56a86f84 | 523 | while (--*num_buf) { |
72979a6c JF |
524 | unsigned int buflen; |
525 | unsigned long ctx; | |
526 | void *buf; | |
527 | int off; | |
528 | ||
529 | ctx = (unsigned long)virtqueue_get_buf(rq->vq, &buflen); | |
530 | if (unlikely(!ctx)) | |
531 | goto err_buf; | |
532 | ||
56a86f84 JW |
533 | buf = mergeable_ctx_to_buf_address(ctx); |
534 | p = virt_to_head_page(buf); | |
535 | off = buf - page_address(p); | |
536 | ||
72979a6c JF |
537 | /* guard against a misconfigured or uncooperative backend that |
538 | * is sending packet larger than the MTU. | |
539 | */ | |
56a86f84 JW |
540 | if ((page_off + buflen) > PAGE_SIZE) { |
541 | put_page(p); | |
72979a6c | 542 | goto err_buf; |
56a86f84 | 543 | } |
72979a6c JF |
544 | |
545 | memcpy(page_address(page) + page_off, | |
546 | page_address(p) + off, buflen); | |
547 | page_off += buflen; | |
56a86f84 | 548 | put_page(p); |
72979a6c JF |
549 | } |
550 | ||
551 | *len = page_off; | |
552 | return page; | |
553 | err_buf: | |
554 | __free_pages(page, 0); | |
555 | return NULL; | |
556 | } | |
557 | ||
8fc3b9e9 | 558 | static struct sk_buff *receive_mergeable(struct net_device *dev, |
fdd819b2 | 559 | struct virtnet_info *vi, |
8fc3b9e9 | 560 | struct receive_queue *rq, |
ab7db917 | 561 | unsigned long ctx, |
8fc3b9e9 | 562 | unsigned int len) |
9ab86bbc | 563 | { |
ab7db917 | 564 | void *buf = mergeable_ctx_to_buf_address(ctx); |
012873d0 MT |
565 | struct virtio_net_hdr_mrg_rxbuf *hdr = buf; |
566 | u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers); | |
8fc3b9e9 MT |
567 | struct page *page = virt_to_head_page(buf); |
568 | int offset = buf - page_address(page); | |
f600b690 JF |
569 | struct sk_buff *head_skb, *curr_skb; |
570 | struct bpf_prog *xdp_prog; | |
571 | unsigned int truesize; | |
572 | ||
56434a01 JF |
573 | head_skb = NULL; |
574 | ||
f600b690 JF |
575 | rcu_read_lock(); |
576 | xdp_prog = rcu_dereference(rq->xdp_prog); | |
577 | if (xdp_prog) { | |
72979a6c | 578 | struct page *xdp_page; |
f600b690 JF |
579 | u32 act; |
580 | ||
73b62bd0 | 581 | /* This happens when rx buffer size is underestimated */ |
f600b690 | 582 | if (unlikely(num_buf > 1)) { |
72979a6c | 583 | /* linearize data for XDP */ |
56a86f84 | 584 | xdp_page = xdp_linearize_page(rq, &num_buf, |
72979a6c JF |
585 | page, offset, &len); |
586 | if (!xdp_page) | |
587 | goto err_xdp; | |
588 | offset = 0; | |
589 | } else { | |
590 | xdp_page = page; | |
f600b690 JF |
591 | } |
592 | ||
593 | /* Transient failure which in theory could occur if | |
594 | * in-flight packets from before XDP was enabled reach | |
595 | * the receive path after XDP is loaded. In practice I | |
596 | * was not able to create this condition. | |
597 | */ | |
b00f70b0 | 598 | if (unlikely(hdr->hdr.gso_type)) |
f600b690 JF |
599 | goto err_xdp; |
600 | ||
bb91accf JW |
601 | act = do_xdp_prog(vi, rq, xdp_prog, |
602 | page_address(xdp_page) + offset, len); | |
56434a01 JF |
603 | switch (act) { |
604 | case XDP_PASS: | |
1830f893 JW |
605 | /* We can only create skb based on xdp_page. */ |
606 | if (unlikely(xdp_page != page)) { | |
607 | rcu_read_unlock(); | |
608 | put_page(page); | |
609 | head_skb = page_to_skb(vi, rq, xdp_page, | |
610 | 0, len, PAGE_SIZE); | |
5c33474d | 611 | ewma_pkt_len_add(&rq->mrg_avg_pkt_len, len); |
1830f893 JW |
612 | return head_skb; |
613 | } | |
56434a01 JF |
614 | break; |
615 | case XDP_TX: | |
5c33474d | 616 | ewma_pkt_len_add(&rq->mrg_avg_pkt_len, len); |
72979a6c JF |
617 | if (unlikely(xdp_page != page)) |
618 | goto err_xdp; | |
56434a01 JF |
619 | rcu_read_unlock(); |
620 | goto xdp_xmit; | |
621 | case XDP_DROP: | |
622 | default: | |
72979a6c JF |
623 | if (unlikely(xdp_page != page)) |
624 | __free_pages(xdp_page, 0); | |
5c33474d | 625 | ewma_pkt_len_add(&rq->mrg_avg_pkt_len, len); |
f600b690 | 626 | goto err_xdp; |
56434a01 | 627 | } |
f600b690 JF |
628 | } |
629 | rcu_read_unlock(); | |
ab7db917 | 630 | |
f600b690 JF |
631 | truesize = max(len, mergeable_ctx_to_buf_truesize(ctx)); |
632 | head_skb = page_to_skb(vi, rq, page, offset, len, truesize); | |
633 | curr_skb = head_skb; | |
9ab86bbc | 634 | |
8fc3b9e9 MT |
635 | if (unlikely(!curr_skb)) |
636 | goto err_skb; | |
9ab86bbc | 637 | while (--num_buf) { |
8fc3b9e9 MT |
638 | int num_skb_frags; |
639 | ||
ab7db917 MD |
640 | ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len); |
641 | if (unlikely(!ctx)) { | |
8fc3b9e9 | 642 | pr_debug("%s: rx error: %d buffers out of %d missing\n", |
fdd819b2 | 643 | dev->name, num_buf, |
012873d0 MT |
644 | virtio16_to_cpu(vi->vdev, |
645 | hdr->num_buffers)); | |
8fc3b9e9 MT |
646 | dev->stats.rx_length_errors++; |
647 | goto err_buf; | |
3f2c31d9 | 648 | } |
8fc3b9e9 | 649 | |
ab7db917 | 650 | buf = mergeable_ctx_to_buf_address(ctx); |
8fc3b9e9 | 651 | page = virt_to_head_page(buf); |
8fc3b9e9 MT |
652 | |
653 | num_skb_frags = skb_shinfo(curr_skb)->nr_frags; | |
2613af0e MD |
654 | if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) { |
655 | struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC); | |
8fc3b9e9 MT |
656 | |
657 | if (unlikely(!nskb)) | |
658 | goto err_skb; | |
2613af0e MD |
659 | if (curr_skb == head_skb) |
660 | skb_shinfo(curr_skb)->frag_list = nskb; | |
661 | else | |
662 | curr_skb->next = nskb; | |
663 | curr_skb = nskb; | |
664 | head_skb->truesize += nskb->truesize; | |
665 | num_skb_frags = 0; | |
666 | } | |
ab7db917 | 667 | truesize = max(len, mergeable_ctx_to_buf_truesize(ctx)); |
2613af0e MD |
668 | if (curr_skb != head_skb) { |
669 | head_skb->data_len += len; | |
670 | head_skb->len += len; | |
fb51879d | 671 | head_skb->truesize += truesize; |
2613af0e | 672 | } |
8fc3b9e9 | 673 | offset = buf - page_address(page); |
ba275241 JW |
674 | if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) { |
675 | put_page(page); | |
676 | skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1, | |
fb51879d | 677 | len, truesize); |
ba275241 JW |
678 | } else { |
679 | skb_add_rx_frag(curr_skb, num_skb_frags, page, | |
fb51879d | 680 | offset, len, truesize); |
ba275241 | 681 | } |
8fc3b9e9 MT |
682 | } |
683 | ||
5377d758 | 684 | ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len); |
8fc3b9e9 MT |
685 | return head_skb; |
686 | ||
f600b690 JF |
687 | err_xdp: |
688 | rcu_read_unlock(); | |
8fc3b9e9 MT |
689 | err_skb: |
690 | put_page(page); | |
691 | while (--num_buf) { | |
ab7db917 MD |
692 | ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len); |
693 | if (unlikely(!ctx)) { | |
8fc3b9e9 MT |
694 | pr_debug("%s: rx error: %d buffers missing\n", |
695 | dev->name, num_buf); | |
696 | dev->stats.rx_length_errors++; | |
697 | break; | |
698 | } | |
ab7db917 | 699 | page = virt_to_head_page(mergeable_ctx_to_buf_address(ctx)); |
8fc3b9e9 | 700 | put_page(page); |
9ab86bbc | 701 | } |
8fc3b9e9 MT |
702 | err_buf: |
703 | dev->stats.rx_dropped++; | |
704 | dev_kfree_skb(head_skb); | |
56434a01 | 705 | xdp_xmit: |
8fc3b9e9 | 706 | return NULL; |
9ab86bbc SM |
707 | } |
708 | ||
946fa564 MT |
709 | static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq, |
710 | void *buf, unsigned int len) | |
9ab86bbc | 711 | { |
e9d7417b | 712 | struct net_device *dev = vi->dev; |
58472a76 | 713 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
9ab86bbc | 714 | struct sk_buff *skb; |
012873d0 | 715 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
3f2c31d9 | 716 | |
bcff3162 | 717 | if (unlikely(len < vi->hdr_len + ETH_HLEN)) { |
9ab86bbc SM |
718 | pr_debug("%s: short packet %i\n", dev->name, len); |
719 | dev->stats.rx_length_errors++; | |
ab7db917 MD |
720 | if (vi->mergeable_rx_bufs) { |
721 | unsigned long ctx = (unsigned long)buf; | |
722 | void *base = mergeable_ctx_to_buf_address(ctx); | |
723 | put_page(virt_to_head_page(base)); | |
724 | } else if (vi->big_packets) { | |
98bfd23c | 725 | give_pages(rq, buf); |
ab7db917 | 726 | } else { |
9ab86bbc | 727 | dev_kfree_skb(buf); |
ab7db917 | 728 | } |
9ab86bbc SM |
729 | return; |
730 | } | |
3f2c31d9 | 731 | |
f121159d | 732 | if (vi->mergeable_rx_bufs) |
fdd819b2 | 733 | skb = receive_mergeable(dev, vi, rq, (unsigned long)buf, len); |
f121159d | 734 | else if (vi->big_packets) |
946fa564 | 735 | skb = receive_big(dev, vi, rq, buf, len); |
f121159d | 736 | else |
bb91accf | 737 | skb = receive_small(dev, vi, rq, buf, len); |
f121159d MT |
738 | |
739 | if (unlikely(!skb)) | |
740 | return; | |
3f2c31d9 | 741 | |
9ab86bbc | 742 | hdr = skb_vnet_hdr(skb); |
3fa2a1df | 743 | |
83a27052 | 744 | u64_stats_update_begin(&stats->rx_syncp); |
3fa2a1df | 745 | stats->rx_bytes += skb->len; |
746 | stats->rx_packets++; | |
83a27052 | 747 | u64_stats_update_end(&stats->rx_syncp); |
296f96fc | 748 | |
e858fae2 | 749 | if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) |
10a8d94a | 750 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
296f96fc | 751 | |
e858fae2 MR |
752 | if (virtio_net_hdr_to_skb(skb, &hdr->hdr, |
753 | virtio_is_little_endian(vi->vdev))) { | |
754 | net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n", | |
755 | dev->name, hdr->hdr.gso_type, | |
756 | hdr->hdr.gso_size); | |
757 | goto frame_err; | |
296f96fc RR |
758 | } |
759 | ||
d1dc06dc MR |
760 | skb->protocol = eth_type_trans(skb, dev); |
761 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
762 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
763 | ||
0fbd050a | 764 | napi_gro_receive(&rq->napi, skb); |
296f96fc RR |
765 | return; |
766 | ||
767 | frame_err: | |
768 | dev->stats.rx_frame_errors++; | |
296f96fc RR |
769 | dev_kfree_skb(skb); |
770 | } | |
771 | ||
946fa564 MT |
772 | static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq, |
773 | gfp_t gfp) | |
296f96fc RR |
774 | { |
775 | struct sk_buff *skb; | |
012873d0 | 776 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
9ab86bbc | 777 | int err; |
3f2c31d9 | 778 | |
5061de36 | 779 | skb = __netdev_alloc_skb_ip_align(vi->dev, GOOD_PACKET_LEN, gfp); |
9ab86bbc SM |
780 | if (unlikely(!skb)) |
781 | return -ENOMEM; | |
296f96fc | 782 | |
5061de36 | 783 | skb_put(skb, GOOD_PACKET_LEN); |
3f2c31d9 | 784 | |
9ab86bbc | 785 | hdr = skb_vnet_hdr(skb); |
547c890c | 786 | sg_init_table(rq->sg, 2); |
012873d0 | 787 | sg_set_buf(rq->sg, hdr, vi->hdr_len); |
e9d7417b | 788 | skb_to_sgvec(skb, rq->sg + 1, 0, skb->len); |
97402b96 | 789 | |
9dc7b9e4 | 790 | err = virtqueue_add_inbuf(rq->vq, rq->sg, 2, skb, gfp); |
9ab86bbc SM |
791 | if (err < 0) |
792 | dev_kfree_skb(skb); | |
97402b96 | 793 | |
9ab86bbc SM |
794 | return err; |
795 | } | |
97402b96 | 796 | |
012873d0 MT |
797 | static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq, |
798 | gfp_t gfp) | |
9ab86bbc | 799 | { |
9ab86bbc SM |
800 | struct page *first, *list = NULL; |
801 | char *p; | |
802 | int i, err, offset; | |
803 | ||
a5835440 RR |
804 | sg_init_table(rq->sg, MAX_SKB_FRAGS + 2); |
805 | ||
e9d7417b | 806 | /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */ |
9ab86bbc | 807 | for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { |
e9d7417b | 808 | first = get_a_page(rq, gfp); |
9ab86bbc SM |
809 | if (!first) { |
810 | if (list) | |
e9d7417b | 811 | give_pages(rq, list); |
9ab86bbc | 812 | return -ENOMEM; |
97402b96 | 813 | } |
e9d7417b | 814 | sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); |
97402b96 | 815 | |
9ab86bbc SM |
816 | /* chain new page in list head to match sg */ |
817 | first->private = (unsigned long)list; | |
818 | list = first; | |
819 | } | |
296f96fc | 820 | |
e9d7417b | 821 | first = get_a_page(rq, gfp); |
9ab86bbc | 822 | if (!first) { |
e9d7417b | 823 | give_pages(rq, list); |
9ab86bbc SM |
824 | return -ENOMEM; |
825 | } | |
826 | p = page_address(first); | |
827 | ||
e9d7417b | 828 | /* rq->sg[0], rq->sg[1] share the same page */ |
012873d0 MT |
829 | /* a separated rq->sg[0] for header - required in case !any_header_sg */ |
830 | sg_set_buf(&rq->sg[0], p, vi->hdr_len); | |
9ab86bbc | 831 | |
e9d7417b | 832 | /* rq->sg[1] for data packet, from offset */ |
9ab86bbc | 833 | offset = sizeof(struct padded_vnet_hdr); |
e9d7417b | 834 | sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); |
9ab86bbc SM |
835 | |
836 | /* chain first in list head */ | |
837 | first->private = (unsigned long)list; | |
9dc7b9e4 RR |
838 | err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2, |
839 | first, gfp); | |
9ab86bbc | 840 | if (err < 0) |
e9d7417b | 841 | give_pages(rq, first); |
9ab86bbc SM |
842 | |
843 | return err; | |
296f96fc RR |
844 | } |
845 | ||
5377d758 | 846 | static unsigned int get_mergeable_buf_len(struct ewma_pkt_len *avg_pkt_len) |
3f2c31d9 | 847 | { |
ab7db917 | 848 | const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); |
fbf28d78 MD |
849 | unsigned int len; |
850 | ||
5377d758 | 851 | len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len), |
fbf28d78 MD |
852 | GOOD_PACKET_LEN, PAGE_SIZE - hdr_len); |
853 | return ALIGN(len, MERGEABLE_BUFFER_ALIGN); | |
854 | } | |
855 | ||
856 | static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp) | |
857 | { | |
fb51879d MD |
858 | struct page_frag *alloc_frag = &rq->alloc_frag; |
859 | char *buf; | |
ab7db917 | 860 | unsigned long ctx; |
3f2c31d9 | 861 | int err; |
fb51879d | 862 | unsigned int len, hole; |
3f2c31d9 | 863 | |
fbf28d78 | 864 | len = get_mergeable_buf_len(&rq->mrg_avg_pkt_len); |
ab7db917 | 865 | if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp))) |
9ab86bbc | 866 | return -ENOMEM; |
ab7db917 | 867 | |
fb51879d | 868 | buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; |
ab7db917 | 869 | ctx = mergeable_buf_to_ctx(buf, len); |
fb51879d | 870 | get_page(alloc_frag->page); |
fb51879d MD |
871 | alloc_frag->offset += len; |
872 | hole = alloc_frag->size - alloc_frag->offset; | |
ab7db917 MD |
873 | if (hole < len) { |
874 | /* To avoid internal fragmentation, if there is very likely not | |
875 | * enough space for another buffer, add the remaining space to | |
876 | * the current buffer. This extra space is not included in | |
877 | * the truesize stored in ctx. | |
878 | */ | |
fb51879d MD |
879 | len += hole; |
880 | alloc_frag->offset += hole; | |
881 | } | |
3f2c31d9 | 882 | |
fb51879d | 883 | sg_init_one(rq->sg, buf, len); |
ab7db917 | 884 | err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, (void *)ctx, gfp); |
9ab86bbc | 885 | if (err < 0) |
2613af0e | 886 | put_page(virt_to_head_page(buf)); |
3f2c31d9 | 887 | |
9ab86bbc SM |
888 | return err; |
889 | } | |
3f2c31d9 | 890 | |
b2baed69 RR |
891 | /* |
892 | * Returns false if we couldn't fill entirely (OOM). | |
893 | * | |
894 | * Normally run in the receive path, but can also be run from ndo_open | |
895 | * before we're receiving packets, or from refill_work which is | |
896 | * careful to disable receiving (using napi_disable). | |
897 | */ | |
946fa564 MT |
898 | static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq, |
899 | gfp_t gfp) | |
9ab86bbc SM |
900 | { |
901 | int err; | |
1788f495 | 902 | bool oom; |
3f2c31d9 | 903 | |
fb51879d | 904 | gfp |= __GFP_COLD; |
9ab86bbc SM |
905 | do { |
906 | if (vi->mergeable_rx_bufs) | |
e9d7417b | 907 | err = add_recvbuf_mergeable(rq, gfp); |
9ab86bbc | 908 | else if (vi->big_packets) |
012873d0 | 909 | err = add_recvbuf_big(vi, rq, gfp); |
9ab86bbc | 910 | else |
946fa564 | 911 | err = add_recvbuf_small(vi, rq, gfp); |
3f2c31d9 | 912 | |
1788f495 | 913 | oom = err == -ENOMEM; |
9ed4cb07 | 914 | if (err) |
3f2c31d9 | 915 | break; |
b7dfde95 | 916 | } while (rq->vq->num_free); |
681daee2 | 917 | virtqueue_kick(rq->vq); |
3161e453 | 918 | return !oom; |
3f2c31d9 MM |
919 | } |
920 | ||
18445c4d | 921 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
922 | { |
923 | struct virtnet_info *vi = rvq->vdev->priv; | |
986a4f4d | 924 | struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; |
e9d7417b | 925 | |
18445c4d | 926 | /* Schedule NAPI, Suppress further interrupts if successful. */ |
e9d7417b | 927 | if (napi_schedule_prep(&rq->napi)) { |
1915a712 | 928 | virtqueue_disable_cb(rvq); |
e9d7417b | 929 | __napi_schedule(&rq->napi); |
18445c4d | 930 | } |
296f96fc RR |
931 | } |
932 | ||
e9d7417b | 933 | static void virtnet_napi_enable(struct receive_queue *rq) |
3e9d08ec | 934 | { |
e9d7417b | 935 | napi_enable(&rq->napi); |
3e9d08ec BR |
936 | |
937 | /* If all buffers were filled by other side before we napi_enabled, we | |
938 | * won't get another interrupt, so process any outstanding packets | |
939 | * now. virtnet_poll wants re-enable the queue, so we disable here. | |
940 | * We synchronize against interrupts via NAPI_STATE_SCHED */ | |
e9d7417b JW |
941 | if (napi_schedule_prep(&rq->napi)) { |
942 | virtqueue_disable_cb(rq->vq); | |
ec13ee80 | 943 | local_bh_disable(); |
e9d7417b | 944 | __napi_schedule(&rq->napi); |
ec13ee80 | 945 | local_bh_enable(); |
3e9d08ec BR |
946 | } |
947 | } | |
948 | ||
3161e453 RR |
949 | static void refill_work(struct work_struct *work) |
950 | { | |
e9d7417b JW |
951 | struct virtnet_info *vi = |
952 | container_of(work, struct virtnet_info, refill.work); | |
3161e453 | 953 | bool still_empty; |
986a4f4d JW |
954 | int i; |
955 | ||
55257d72 | 956 | for (i = 0; i < vi->curr_queue_pairs; i++) { |
986a4f4d | 957 | struct receive_queue *rq = &vi->rq[i]; |
3161e453 | 958 | |
986a4f4d | 959 | napi_disable(&rq->napi); |
946fa564 | 960 | still_empty = !try_fill_recv(vi, rq, GFP_KERNEL); |
986a4f4d | 961 | virtnet_napi_enable(rq); |
3161e453 | 962 | |
986a4f4d JW |
963 | /* In theory, this can happen: if we don't get any buffers in |
964 | * we will *never* try to fill again. | |
965 | */ | |
966 | if (still_empty) | |
967 | schedule_delayed_work(&vi->refill, HZ/2); | |
968 | } | |
3161e453 RR |
969 | } |
970 | ||
2ffa7598 | 971 | static int virtnet_receive(struct receive_queue *rq, int budget) |
296f96fc | 972 | { |
e9d7417b | 973 | struct virtnet_info *vi = rq->vq->vdev->priv; |
2ffa7598 | 974 | unsigned int len, received = 0; |
9ab86bbc | 975 | void *buf; |
296f96fc | 976 | |
296f96fc | 977 | while (received < budget && |
e9d7417b | 978 | (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { |
946fa564 | 979 | receive_buf(vi, rq, buf, len); |
296f96fc RR |
980 | received++; |
981 | } | |
982 | ||
be121f46 | 983 | if (rq->vq->num_free > virtqueue_get_vring_size(rq->vq) / 2) { |
946fa564 | 984 | if (!try_fill_recv(vi, rq, GFP_ATOMIC)) |
3b07e9ca | 985 | schedule_delayed_work(&vi->refill, 0); |
3161e453 | 986 | } |
296f96fc | 987 | |
2ffa7598 JW |
988 | return received; |
989 | } | |
990 | ||
991 | static int virtnet_poll(struct napi_struct *napi, int budget) | |
992 | { | |
993 | struct receive_queue *rq = | |
994 | container_of(napi, struct receive_queue, napi); | |
faadb05f | 995 | unsigned int r, received; |
2ffa7598 | 996 | |
faadb05f | 997 | received = virtnet_receive(rq, budget); |
2ffa7598 | 998 | |
8329d98e RR |
999 | /* Out of packets? */ |
1000 | if (received < budget) { | |
cbdadbbf | 1001 | r = virtqueue_enable_cb_prepare(rq->vq); |
0fbd050a | 1002 | napi_complete_done(napi, received); |
cbdadbbf | 1003 | if (unlikely(virtqueue_poll(rq->vq, r)) && |
8e95a202 | 1004 | napi_schedule_prep(napi)) { |
e9d7417b | 1005 | virtqueue_disable_cb(rq->vq); |
288379f0 | 1006 | __napi_schedule(napi); |
4265f161 | 1007 | } |
296f96fc RR |
1008 | } |
1009 | ||
1010 | return received; | |
1011 | } | |
1012 | ||
91815639 JW |
1013 | #ifdef CONFIG_NET_RX_BUSY_POLL |
1014 | /* must be called with local_bh_disable()d */ | |
1015 | static int virtnet_busy_poll(struct napi_struct *napi) | |
1016 | { | |
1017 | struct receive_queue *rq = | |
1018 | container_of(napi, struct receive_queue, napi); | |
1019 | struct virtnet_info *vi = rq->vq->vdev->priv; | |
1020 | int r, received = 0, budget = 4; | |
1021 | ||
1022 | if (!(vi->status & VIRTIO_NET_S_LINK_UP)) | |
1023 | return LL_FLUSH_FAILED; | |
1024 | ||
1025 | if (!napi_schedule_prep(napi)) | |
1026 | return LL_FLUSH_BUSY; | |
1027 | ||
1028 | virtqueue_disable_cb(rq->vq); | |
1029 | ||
1030 | again: | |
1031 | received += virtnet_receive(rq, budget); | |
1032 | ||
1033 | r = virtqueue_enable_cb_prepare(rq->vq); | |
1034 | clear_bit(NAPI_STATE_SCHED, &napi->state); | |
1035 | if (unlikely(virtqueue_poll(rq->vq, r)) && | |
1036 | napi_schedule_prep(napi)) { | |
1037 | virtqueue_disable_cb(rq->vq); | |
1038 | if (received < budget) { | |
1039 | budget -= received; | |
1040 | goto again; | |
1041 | } else { | |
1042 | __napi_schedule(napi); | |
1043 | } | |
1044 | } | |
1045 | ||
1046 | return received; | |
1047 | } | |
1048 | #endif /* CONFIG_NET_RX_BUSY_POLL */ | |
1049 | ||
986a4f4d JW |
1050 | static int virtnet_open(struct net_device *dev) |
1051 | { | |
1052 | struct virtnet_info *vi = netdev_priv(dev); | |
1053 | int i; | |
1054 | ||
e4166625 JW |
1055 | for (i = 0; i < vi->max_queue_pairs; i++) { |
1056 | if (i < vi->curr_queue_pairs) | |
1057 | /* Make sure we have some buffers: if oom use wq. */ | |
946fa564 | 1058 | if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) |
e4166625 | 1059 | schedule_delayed_work(&vi->refill, 0); |
986a4f4d JW |
1060 | virtnet_napi_enable(&vi->rq[i]); |
1061 | } | |
1062 | ||
1063 | return 0; | |
1064 | } | |
1065 | ||
b7dfde95 | 1066 | static void free_old_xmit_skbs(struct send_queue *sq) |
296f96fc RR |
1067 | { |
1068 | struct sk_buff *skb; | |
6ee57bcc | 1069 | unsigned int len; |
e9d7417b | 1070 | struct virtnet_info *vi = sq->vq->vdev->priv; |
58472a76 | 1071 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
296f96fc | 1072 | |
e9d7417b | 1073 | while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) { |
296f96fc | 1074 | pr_debug("Sent skb %p\n", skb); |
3fa2a1df | 1075 | |
83a27052 | 1076 | u64_stats_update_begin(&stats->tx_syncp); |
3fa2a1df | 1077 | stats->tx_bytes += skb->len; |
1078 | stats->tx_packets++; | |
83a27052 | 1079 | u64_stats_update_end(&stats->tx_syncp); |
3fa2a1df | 1080 | |
ed79bab8 | 1081 | dev_kfree_skb_any(skb); |
296f96fc RR |
1082 | } |
1083 | } | |
1084 | ||
e9d7417b | 1085 | static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) |
296f96fc | 1086 | { |
012873d0 | 1087 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
296f96fc | 1088 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; |
e9d7417b | 1089 | struct virtnet_info *vi = sq->vq->vdev->priv; |
7bedc7dc | 1090 | unsigned num_sg; |
012873d0 | 1091 | unsigned hdr_len = vi->hdr_len; |
e7428e95 | 1092 | bool can_push; |
296f96fc | 1093 | |
e174961c | 1094 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
e7428e95 MT |
1095 | |
1096 | can_push = vi->any_header_sg && | |
1097 | !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) && | |
1098 | !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len; | |
1099 | /* Even if we can, don't push here yet as this would skew | |
1100 | * csum_start offset below. */ | |
1101 | if (can_push) | |
012873d0 | 1102 | hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len); |
e7428e95 MT |
1103 | else |
1104 | hdr = skb_vnet_hdr(skb); | |
296f96fc | 1105 | |
e858fae2 MR |
1106 | if (virtio_net_hdr_from_skb(skb, &hdr->hdr, |
1107 | virtio_is_little_endian(vi->vdev))) | |
1108 | BUG(); | |
296f96fc | 1109 | |
3f2c31d9 | 1110 | if (vi->mergeable_rx_bufs) |
012873d0 | 1111 | hdr->num_buffers = 0; |
3f2c31d9 | 1112 | |
547c890c | 1113 | sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2)); |
e7428e95 MT |
1114 | if (can_push) { |
1115 | __skb_push(skb, hdr_len); | |
1116 | num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len); | |
1117 | /* Pull header back to avoid skew in tx bytes calculations. */ | |
1118 | __skb_pull(skb, hdr_len); | |
1119 | } else { | |
1120 | sg_set_buf(sq->sg, hdr, hdr_len); | |
1121 | num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1; | |
1122 | } | |
9dc7b9e4 | 1123 | return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); |
11a3a154 RR |
1124 | } |
1125 | ||
424efe9c | 1126 | static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) |
99ffc696 RR |
1127 | { |
1128 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d JW |
1129 | int qnum = skb_get_queue_mapping(skb); |
1130 | struct send_queue *sq = &vi->sq[qnum]; | |
9ed4cb07 | 1131 | int err; |
4b7fd2e6 MT |
1132 | struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum); |
1133 | bool kick = !skb->xmit_more; | |
2cb9c6ba | 1134 | |
2cb9c6ba | 1135 | /* Free up any pending old buffers before queueing new ones. */ |
e9d7417b | 1136 | free_old_xmit_skbs(sq); |
99ffc696 | 1137 | |
074c3582 JK |
1138 | /* timestamp packet in software */ |
1139 | skb_tx_timestamp(skb); | |
1140 | ||
03f191ba | 1141 | /* Try to transmit */ |
b7dfde95 | 1142 | err = xmit_skb(sq, skb); |
48925e37 | 1143 | |
9ed4cb07 | 1144 | /* This should not happen! */ |
681daee2 | 1145 | if (unlikely(err)) { |
9ed4cb07 RR |
1146 | dev->stats.tx_fifo_errors++; |
1147 | if (net_ratelimit()) | |
1148 | dev_warn(&dev->dev, | |
b7dfde95 | 1149 | "Unexpected TXQ (%d) queue failure: %d\n", qnum, err); |
58eba97d | 1150 | dev->stats.tx_dropped++; |
85e94525 | 1151 | dev_kfree_skb_any(skb); |
58eba97d | 1152 | return NETDEV_TX_OK; |
296f96fc | 1153 | } |
03f191ba | 1154 | |
48925e37 RR |
1155 | /* Don't wait up for transmitted skbs to be freed. */ |
1156 | skb_orphan(skb); | |
1157 | nf_reset(skb); | |
1158 | ||
60302ff6 MT |
1159 | /* If running out of space, stop queue to avoid getting packets that we |
1160 | * are then unable to transmit. | |
1161 | * An alternative would be to force queuing layer to requeue the skb by | |
1162 | * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be | |
1163 | * returned in a normal path of operation: it means that driver is not | |
1164 | * maintaining the TX queue stop/start state properly, and causes | |
1165 | * the stack to do a non-trivial amount of useless work. | |
1166 | * Since most packets only take 1 or 2 ring slots, stopping the queue | |
1167 | * early means 16 slots are typically wasted. | |
d631b94e | 1168 | */ |
b7dfde95 | 1169 | if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { |
986a4f4d | 1170 | netif_stop_subqueue(dev, qnum); |
e9d7417b | 1171 | if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { |
48925e37 | 1172 | /* More just got used, free them then recheck. */ |
b7dfde95 LT |
1173 | free_old_xmit_skbs(sq); |
1174 | if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { | |
986a4f4d | 1175 | netif_start_subqueue(dev, qnum); |
e9d7417b | 1176 | virtqueue_disable_cb(sq->vq); |
48925e37 RR |
1177 | } |
1178 | } | |
99ffc696 | 1179 | } |
48925e37 | 1180 | |
4b7fd2e6 | 1181 | if (kick || netif_xmit_stopped(txq)) |
0b725a2c | 1182 | virtqueue_kick(sq->vq); |
296f96fc | 1183 | |
0b725a2c | 1184 | return NETDEV_TX_OK; |
c223a078 DM |
1185 | } |
1186 | ||
40cbfc37 AK |
1187 | /* |
1188 | * Send command via the control virtqueue and check status. Commands | |
1189 | * supported by the hypervisor, as indicated by feature bits, should | |
788a8b6d | 1190 | * never fail unless improperly formatted. |
40cbfc37 AK |
1191 | */ |
1192 | static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, | |
d24bae32 | 1193 | struct scatterlist *out) |
40cbfc37 | 1194 | { |
f7bc9594 | 1195 | struct scatterlist *sgs[4], hdr, stat; |
d24bae32 | 1196 | unsigned out_num = 0, tmp; |
40cbfc37 AK |
1197 | |
1198 | /* Caller should know better */ | |
f7bc9594 | 1199 | BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); |
40cbfc37 | 1200 | |
2ac46030 MT |
1201 | vi->ctrl_status = ~0; |
1202 | vi->ctrl_hdr.class = class; | |
1203 | vi->ctrl_hdr.cmd = cmd; | |
f7bc9594 | 1204 | /* Add header */ |
2ac46030 | 1205 | sg_init_one(&hdr, &vi->ctrl_hdr, sizeof(vi->ctrl_hdr)); |
f7bc9594 | 1206 | sgs[out_num++] = &hdr; |
40cbfc37 | 1207 | |
f7bc9594 RR |
1208 | if (out) |
1209 | sgs[out_num++] = out; | |
40cbfc37 | 1210 | |
f7bc9594 | 1211 | /* Add return status. */ |
2ac46030 | 1212 | sg_init_one(&stat, &vi->ctrl_status, sizeof(vi->ctrl_status)); |
d24bae32 | 1213 | sgs[out_num] = &stat; |
40cbfc37 | 1214 | |
d24bae32 | 1215 | BUG_ON(out_num + 1 > ARRAY_SIZE(sgs)); |
a7c58146 | 1216 | virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC); |
40cbfc37 | 1217 | |
67975901 | 1218 | if (unlikely(!virtqueue_kick(vi->cvq))) |
2ac46030 | 1219 | return vi->ctrl_status == VIRTIO_NET_OK; |
40cbfc37 AK |
1220 | |
1221 | /* Spin for a response, the kick causes an ioport write, trapping | |
1222 | * into the hypervisor, so the request should be handled immediately. | |
1223 | */ | |
047b9b94 HG |
1224 | while (!virtqueue_get_buf(vi->cvq, &tmp) && |
1225 | !virtqueue_is_broken(vi->cvq)) | |
40cbfc37 AK |
1226 | cpu_relax(); |
1227 | ||
2ac46030 | 1228 | return vi->ctrl_status == VIRTIO_NET_OK; |
40cbfc37 AK |
1229 | } |
1230 | ||
9c46f6d4 AW |
1231 | static int virtnet_set_mac_address(struct net_device *dev, void *p) |
1232 | { | |
1233 | struct virtnet_info *vi = netdev_priv(dev); | |
1234 | struct virtio_device *vdev = vi->vdev; | |
f2f2c8b4 | 1235 | int ret; |
e37e2ff3 | 1236 | struct sockaddr *addr; |
7e58d5ae | 1237 | struct scatterlist sg; |
9c46f6d4 | 1238 | |
801822d1 | 1239 | addr = kmemdup(p, sizeof(*addr), GFP_KERNEL); |
e37e2ff3 AL |
1240 | if (!addr) |
1241 | return -ENOMEM; | |
e37e2ff3 AL |
1242 | |
1243 | ret = eth_prepare_mac_addr_change(dev, addr); | |
f2f2c8b4 | 1244 | if (ret) |
e37e2ff3 | 1245 | goto out; |
9c46f6d4 | 1246 | |
7e58d5ae AK |
1247 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { |
1248 | sg_init_one(&sg, addr->sa_data, dev->addr_len); | |
1249 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
d24bae32 | 1250 | VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { |
7e58d5ae AK |
1251 | dev_warn(&vdev->dev, |
1252 | "Failed to set mac address by vq command.\n"); | |
e37e2ff3 AL |
1253 | ret = -EINVAL; |
1254 | goto out; | |
7e58d5ae | 1255 | } |
7e93a02f MT |
1256 | } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && |
1257 | !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { | |
855e0c52 RR |
1258 | unsigned int i; |
1259 | ||
1260 | /* Naturally, this has an atomicity problem. */ | |
1261 | for (i = 0; i < dev->addr_len; i++) | |
1262 | virtio_cwrite8(vdev, | |
1263 | offsetof(struct virtio_net_config, mac) + | |
1264 | i, addr->sa_data[i]); | |
7e58d5ae AK |
1265 | } |
1266 | ||
1267 | eth_commit_mac_addr_change(dev, p); | |
e37e2ff3 | 1268 | ret = 0; |
9c46f6d4 | 1269 | |
e37e2ff3 AL |
1270 | out: |
1271 | kfree(addr); | |
1272 | return ret; | |
9c46f6d4 AW |
1273 | } |
1274 | ||
3fa2a1df | 1275 | static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, |
1276 | struct rtnl_link_stats64 *tot) | |
1277 | { | |
1278 | struct virtnet_info *vi = netdev_priv(dev); | |
1279 | int cpu; | |
1280 | unsigned int start; | |
1281 | ||
1282 | for_each_possible_cpu(cpu) { | |
58472a76 | 1283 | struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu); |
3fa2a1df | 1284 | u64 tpackets, tbytes, rpackets, rbytes; |
1285 | ||
1286 | do { | |
57a7744e | 1287 | start = u64_stats_fetch_begin_irq(&stats->tx_syncp); |
3fa2a1df | 1288 | tpackets = stats->tx_packets; |
1289 | tbytes = stats->tx_bytes; | |
57a7744e | 1290 | } while (u64_stats_fetch_retry_irq(&stats->tx_syncp, start)); |
83a27052 ED |
1291 | |
1292 | do { | |
57a7744e | 1293 | start = u64_stats_fetch_begin_irq(&stats->rx_syncp); |
3fa2a1df | 1294 | rpackets = stats->rx_packets; |
1295 | rbytes = stats->rx_bytes; | |
57a7744e | 1296 | } while (u64_stats_fetch_retry_irq(&stats->rx_syncp, start)); |
3fa2a1df | 1297 | |
1298 | tot->rx_packets += rpackets; | |
1299 | tot->tx_packets += tpackets; | |
1300 | tot->rx_bytes += rbytes; | |
1301 | tot->tx_bytes += tbytes; | |
1302 | } | |
1303 | ||
1304 | tot->tx_dropped = dev->stats.tx_dropped; | |
021ac8d3 | 1305 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; |
3fa2a1df | 1306 | tot->rx_dropped = dev->stats.rx_dropped; |
1307 | tot->rx_length_errors = dev->stats.rx_length_errors; | |
1308 | tot->rx_frame_errors = dev->stats.rx_frame_errors; | |
1309 | ||
1310 | return tot; | |
1311 | } | |
1312 | ||
da74e89d AS |
1313 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1314 | static void virtnet_netpoll(struct net_device *dev) | |
1315 | { | |
1316 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 1317 | int i; |
da74e89d | 1318 | |
986a4f4d JW |
1319 | for (i = 0; i < vi->curr_queue_pairs; i++) |
1320 | napi_schedule(&vi->rq[i].napi); | |
da74e89d AS |
1321 | } |
1322 | #endif | |
1323 | ||
586d17c5 JW |
1324 | static void virtnet_ack_link_announce(struct virtnet_info *vi) |
1325 | { | |
1326 | rtnl_lock(); | |
1327 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, | |
d24bae32 | 1328 | VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) |
586d17c5 JW |
1329 | dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); |
1330 | rtnl_unlock(); | |
1331 | } | |
1332 | ||
986a4f4d JW |
1333 | static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) |
1334 | { | |
1335 | struct scatterlist sg; | |
986a4f4d JW |
1336 | struct net_device *dev = vi->dev; |
1337 | ||
1338 | if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) | |
1339 | return 0; | |
1340 | ||
a725ee3e AL |
1341 | vi->ctrl_mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs); |
1342 | sg_init_one(&sg, &vi->ctrl_mq, sizeof(vi->ctrl_mq)); | |
986a4f4d JW |
1343 | |
1344 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, | |
d24bae32 | 1345 | VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { |
986a4f4d JW |
1346 | dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", |
1347 | queue_pairs); | |
1348 | return -EINVAL; | |
55257d72 | 1349 | } else { |
986a4f4d | 1350 | vi->curr_queue_pairs = queue_pairs; |
35ed159b JW |
1351 | /* virtnet_open() will refill when device is going to up. */ |
1352 | if (dev->flags & IFF_UP) | |
1353 | schedule_delayed_work(&vi->refill, 0); | |
55257d72 | 1354 | } |
986a4f4d JW |
1355 | |
1356 | return 0; | |
1357 | } | |
1358 | ||
296f96fc RR |
1359 | static int virtnet_close(struct net_device *dev) |
1360 | { | |
1361 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 1362 | int i; |
296f96fc | 1363 | |
b2baed69 RR |
1364 | /* Make sure refill_work doesn't re-enable napi! */ |
1365 | cancel_delayed_work_sync(&vi->refill); | |
986a4f4d JW |
1366 | |
1367 | for (i = 0; i < vi->max_queue_pairs; i++) | |
1368 | napi_disable(&vi->rq[i].napi); | |
296f96fc | 1369 | |
296f96fc RR |
1370 | return 0; |
1371 | } | |
1372 | ||
2af7698e AW |
1373 | static void virtnet_set_rx_mode(struct net_device *dev) |
1374 | { | |
1375 | struct virtnet_info *vi = netdev_priv(dev); | |
f565a7c2 | 1376 | struct scatterlist sg[2]; |
f565a7c2 | 1377 | struct virtio_net_ctrl_mac *mac_data; |
ccffad25 | 1378 | struct netdev_hw_addr *ha; |
32e7bfc4 | 1379 | int uc_count; |
4cd24eaf | 1380 | int mc_count; |
f565a7c2 AW |
1381 | void *buf; |
1382 | int i; | |
2af7698e | 1383 | |
788a8b6d | 1384 | /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ |
2af7698e AW |
1385 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) |
1386 | return; | |
1387 | ||
2ac46030 MT |
1388 | vi->ctrl_promisc = ((dev->flags & IFF_PROMISC) != 0); |
1389 | vi->ctrl_allmulti = ((dev->flags & IFF_ALLMULTI) != 0); | |
2af7698e | 1390 | |
2ac46030 | 1391 | sg_init_one(sg, &vi->ctrl_promisc, sizeof(vi->ctrl_promisc)); |
2af7698e AW |
1392 | |
1393 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
d24bae32 | 1394 | VIRTIO_NET_CTRL_RX_PROMISC, sg)) |
2af7698e | 1395 | dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", |
2ac46030 | 1396 | vi->ctrl_promisc ? "en" : "dis"); |
2af7698e | 1397 | |
2ac46030 | 1398 | sg_init_one(sg, &vi->ctrl_allmulti, sizeof(vi->ctrl_allmulti)); |
2af7698e AW |
1399 | |
1400 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
d24bae32 | 1401 | VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) |
2af7698e | 1402 | dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", |
2ac46030 | 1403 | vi->ctrl_allmulti ? "en" : "dis"); |
f565a7c2 | 1404 | |
32e7bfc4 | 1405 | uc_count = netdev_uc_count(dev); |
4cd24eaf | 1406 | mc_count = netdev_mc_count(dev); |
f565a7c2 | 1407 | /* MAC filter - use one buffer for both lists */ |
4cd24eaf JP |
1408 | buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + |
1409 | (2 * sizeof(mac_data->entries)), GFP_ATOMIC); | |
1410 | mac_data = buf; | |
e68ed8f0 | 1411 | if (!buf) |
f565a7c2 | 1412 | return; |
f565a7c2 | 1413 | |
23e258e1 AW |
1414 | sg_init_table(sg, 2); |
1415 | ||
f565a7c2 | 1416 | /* Store the unicast list and count in the front of the buffer */ |
fdd819b2 | 1417 | mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count); |
ccffad25 | 1418 | i = 0; |
32e7bfc4 | 1419 | netdev_for_each_uc_addr(ha, dev) |
ccffad25 | 1420 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); |
f565a7c2 AW |
1421 | |
1422 | sg_set_buf(&sg[0], mac_data, | |
32e7bfc4 | 1423 | sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); |
f565a7c2 AW |
1424 | |
1425 | /* multicast list and count fill the end */ | |
32e7bfc4 | 1426 | mac_data = (void *)&mac_data->macs[uc_count][0]; |
f565a7c2 | 1427 | |
fdd819b2 | 1428 | mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count); |
567ec874 | 1429 | i = 0; |
22bedad3 JP |
1430 | netdev_for_each_mc_addr(ha, dev) |
1431 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); | |
f565a7c2 AW |
1432 | |
1433 | sg_set_buf(&sg[1], mac_data, | |
4cd24eaf | 1434 | sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); |
f565a7c2 AW |
1435 | |
1436 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
d24bae32 | 1437 | VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) |
99e872ae | 1438 | dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); |
f565a7c2 AW |
1439 | |
1440 | kfree(buf); | |
2af7698e AW |
1441 | } |
1442 | ||
80d5c368 PM |
1443 | static int virtnet_vlan_rx_add_vid(struct net_device *dev, |
1444 | __be16 proto, u16 vid) | |
0bde9569 AW |
1445 | { |
1446 | struct virtnet_info *vi = netdev_priv(dev); | |
1447 | struct scatterlist sg; | |
1448 | ||
a725ee3e AL |
1449 | vi->ctrl_vid = vid; |
1450 | sg_init_one(&sg, &vi->ctrl_vid, sizeof(vi->ctrl_vid)); | |
0bde9569 AW |
1451 | |
1452 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
d24bae32 | 1453 | VIRTIO_NET_CTRL_VLAN_ADD, &sg)) |
0bde9569 | 1454 | dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); |
8e586137 | 1455 | return 0; |
0bde9569 AW |
1456 | } |
1457 | ||
80d5c368 PM |
1458 | static int virtnet_vlan_rx_kill_vid(struct net_device *dev, |
1459 | __be16 proto, u16 vid) | |
0bde9569 AW |
1460 | { |
1461 | struct virtnet_info *vi = netdev_priv(dev); | |
1462 | struct scatterlist sg; | |
1463 | ||
a725ee3e AL |
1464 | vi->ctrl_vid = vid; |
1465 | sg_init_one(&sg, &vi->ctrl_vid, sizeof(vi->ctrl_vid)); | |
0bde9569 AW |
1466 | |
1467 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
d24bae32 | 1468 | VIRTIO_NET_CTRL_VLAN_DEL, &sg)) |
0bde9569 | 1469 | dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); |
8e586137 | 1470 | return 0; |
0bde9569 AW |
1471 | } |
1472 | ||
8898c21c | 1473 | static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu) |
986a4f4d JW |
1474 | { |
1475 | int i; | |
1476 | ||
8898c21c WG |
1477 | if (vi->affinity_hint_set) { |
1478 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
47be2479 WG |
1479 | virtqueue_set_affinity(vi->rq[i].vq, -1); |
1480 | virtqueue_set_affinity(vi->sq[i].vq, -1); | |
1481 | } | |
1482 | ||
8898c21c WG |
1483 | vi->affinity_hint_set = false; |
1484 | } | |
8898c21c | 1485 | } |
47be2479 | 1486 | |
8898c21c WG |
1487 | static void virtnet_set_affinity(struct virtnet_info *vi) |
1488 | { | |
1489 | int i; | |
1490 | int cpu; | |
986a4f4d JW |
1491 | |
1492 | /* In multiqueue mode, when the number of cpu is equal to the number of | |
1493 | * queue pairs, we let the queue pairs to be private to one cpu by | |
1494 | * setting the affinity hint to eliminate the contention. | |
1495 | */ | |
8898c21c WG |
1496 | if (vi->curr_queue_pairs == 1 || |
1497 | vi->max_queue_pairs != num_online_cpus()) { | |
1498 | virtnet_clean_affinity(vi, -1); | |
1499 | return; | |
986a4f4d JW |
1500 | } |
1501 | ||
8898c21c WG |
1502 | i = 0; |
1503 | for_each_online_cpu(cpu) { | |
986a4f4d JW |
1504 | virtqueue_set_affinity(vi->rq[i].vq, cpu); |
1505 | virtqueue_set_affinity(vi->sq[i].vq, cpu); | |
9bb8ca86 | 1506 | netif_set_xps_queue(vi->dev, cpumask_of(cpu), i); |
8898c21c | 1507 | i++; |
986a4f4d JW |
1508 | } |
1509 | ||
8898c21c | 1510 | vi->affinity_hint_set = true; |
986a4f4d JW |
1511 | } |
1512 | ||
8017c279 | 1513 | static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node) |
8de4b2f3 | 1514 | { |
8017c279 SAS |
1515 | struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, |
1516 | node); | |
1517 | virtnet_set_affinity(vi); | |
1518 | return 0; | |
1519 | } | |
8de4b2f3 | 1520 | |
8017c279 SAS |
1521 | static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node) |
1522 | { | |
1523 | struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, | |
1524 | node_dead); | |
1525 | virtnet_set_affinity(vi); | |
1526 | return 0; | |
1527 | } | |
3ab098df | 1528 | |
8017c279 SAS |
1529 | static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node) |
1530 | { | |
1531 | struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, | |
1532 | node); | |
1533 | ||
1534 | virtnet_clean_affinity(vi, cpu); | |
1535 | return 0; | |
1536 | } | |
1537 | ||
1538 | static enum cpuhp_state virtionet_online; | |
1539 | ||
1540 | static int virtnet_cpu_notif_add(struct virtnet_info *vi) | |
1541 | { | |
1542 | int ret; | |
1543 | ||
1544 | ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node); | |
1545 | if (ret) | |
1546 | return ret; | |
1547 | ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD, | |
1548 | &vi->node_dead); | |
1549 | if (!ret) | |
1550 | return ret; | |
1551 | cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); | |
1552 | return ret; | |
1553 | } | |
1554 | ||
1555 | static void virtnet_cpu_notif_remove(struct virtnet_info *vi) | |
1556 | { | |
1557 | cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); | |
1558 | cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD, | |
1559 | &vi->node_dead); | |
986a4f4d JW |
1560 | } |
1561 | ||
8f9f4668 RJ |
1562 | static void virtnet_get_ringparam(struct net_device *dev, |
1563 | struct ethtool_ringparam *ring) | |
1564 | { | |
1565 | struct virtnet_info *vi = netdev_priv(dev); | |
1566 | ||
986a4f4d JW |
1567 | ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); |
1568 | ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); | |
8f9f4668 RJ |
1569 | ring->rx_pending = ring->rx_max_pending; |
1570 | ring->tx_pending = ring->tx_max_pending; | |
8f9f4668 RJ |
1571 | } |
1572 | ||
66846048 RJ |
1573 | |
1574 | static void virtnet_get_drvinfo(struct net_device *dev, | |
1575 | struct ethtool_drvinfo *info) | |
1576 | { | |
1577 | struct virtnet_info *vi = netdev_priv(dev); | |
1578 | struct virtio_device *vdev = vi->vdev; | |
1579 | ||
1580 | strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); | |
1581 | strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); | |
1582 | strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); | |
1583 | ||
1584 | } | |
1585 | ||
d73bcd2c JW |
1586 | /* TODO: Eliminate OOO packets during switching */ |
1587 | static int virtnet_set_channels(struct net_device *dev, | |
1588 | struct ethtool_channels *channels) | |
1589 | { | |
1590 | struct virtnet_info *vi = netdev_priv(dev); | |
1591 | u16 queue_pairs = channels->combined_count; | |
1592 | int err; | |
1593 | ||
1594 | /* We don't support separate rx/tx channels. | |
1595 | * We don't allow setting 'other' channels. | |
1596 | */ | |
1597 | if (channels->rx_count || channels->tx_count || channels->other_count) | |
1598 | return -EINVAL; | |
1599 | ||
c18e9cd6 | 1600 | if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) |
d73bcd2c JW |
1601 | return -EINVAL; |
1602 | ||
f600b690 JF |
1603 | /* For now we don't support modifying channels while XDP is loaded |
1604 | * also when XDP is loaded all RX queues have XDP programs so we only | |
1605 | * need to check a single RX queue. | |
1606 | */ | |
1607 | if (vi->rq[0].xdp_prog) | |
1608 | return -EINVAL; | |
1609 | ||
47be2479 | 1610 | get_online_cpus(); |
d73bcd2c JW |
1611 | err = virtnet_set_queues(vi, queue_pairs); |
1612 | if (!err) { | |
1613 | netif_set_real_num_tx_queues(dev, queue_pairs); | |
1614 | netif_set_real_num_rx_queues(dev, queue_pairs); | |
1615 | ||
8898c21c | 1616 | virtnet_set_affinity(vi); |
d73bcd2c | 1617 | } |
47be2479 | 1618 | put_online_cpus(); |
d73bcd2c JW |
1619 | |
1620 | return err; | |
1621 | } | |
1622 | ||
1623 | static void virtnet_get_channels(struct net_device *dev, | |
1624 | struct ethtool_channels *channels) | |
1625 | { | |
1626 | struct virtnet_info *vi = netdev_priv(dev); | |
1627 | ||
1628 | channels->combined_count = vi->curr_queue_pairs; | |
1629 | channels->max_combined = vi->max_queue_pairs; | |
1630 | channels->max_other = 0; | |
1631 | channels->rx_count = 0; | |
1632 | channels->tx_count = 0; | |
1633 | channels->other_count = 0; | |
1634 | } | |
1635 | ||
16032be5 NA |
1636 | /* Check if the user is trying to change anything besides speed/duplex */ |
1637 | static bool virtnet_validate_ethtool_cmd(const struct ethtool_cmd *cmd) | |
1638 | { | |
1639 | struct ethtool_cmd diff1 = *cmd; | |
1640 | struct ethtool_cmd diff2 = {}; | |
1641 | ||
0cf3ace9 NA |
1642 | /* cmd is always set so we need to clear it, validate the port type |
1643 | * and also without autonegotiation we can ignore advertising | |
1644 | */ | |
16032be5 | 1645 | ethtool_cmd_speed_set(&diff1, 0); |
0cf3ace9 | 1646 | diff2.port = PORT_OTHER; |
16032be5 NA |
1647 | diff1.advertising = 0; |
1648 | diff1.duplex = 0; | |
16032be5 NA |
1649 | diff1.cmd = 0; |
1650 | ||
1651 | return !memcmp(&diff1, &diff2, sizeof(diff1)); | |
1652 | } | |
1653 | ||
1654 | static int virtnet_set_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
1655 | { | |
1656 | struct virtnet_info *vi = netdev_priv(dev); | |
1657 | u32 speed; | |
1658 | ||
1659 | speed = ethtool_cmd_speed(cmd); | |
1660 | /* don't allow custom speed and duplex */ | |
1661 | if (!ethtool_validate_speed(speed) || | |
1662 | !ethtool_validate_duplex(cmd->duplex) || | |
1663 | !virtnet_validate_ethtool_cmd(cmd)) | |
1664 | return -EINVAL; | |
1665 | vi->speed = speed; | |
1666 | vi->duplex = cmd->duplex; | |
1667 | ||
1668 | return 0; | |
1669 | } | |
1670 | ||
1671 | static int virtnet_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
1672 | { | |
1673 | struct virtnet_info *vi = netdev_priv(dev); | |
1674 | ||
1675 | ethtool_cmd_speed_set(cmd, vi->speed); | |
1676 | cmd->duplex = vi->duplex; | |
1677 | cmd->port = PORT_OTHER; | |
1678 | ||
1679 | return 0; | |
1680 | } | |
1681 | ||
1682 | static void virtnet_init_settings(struct net_device *dev) | |
1683 | { | |
1684 | struct virtnet_info *vi = netdev_priv(dev); | |
1685 | ||
1686 | vi->speed = SPEED_UNKNOWN; | |
1687 | vi->duplex = DUPLEX_UNKNOWN; | |
1688 | } | |
1689 | ||
0fc0b732 | 1690 | static const struct ethtool_ops virtnet_ethtool_ops = { |
66846048 | 1691 | .get_drvinfo = virtnet_get_drvinfo, |
9f4d26d0 | 1692 | .get_link = ethtool_op_get_link, |
8f9f4668 | 1693 | .get_ringparam = virtnet_get_ringparam, |
d73bcd2c JW |
1694 | .set_channels = virtnet_set_channels, |
1695 | .get_channels = virtnet_get_channels, | |
074c3582 | 1696 | .get_ts_info = ethtool_op_get_ts_info, |
16032be5 NA |
1697 | .get_settings = virtnet_get_settings, |
1698 | .set_settings = virtnet_set_settings, | |
a9ea3fc6 HX |
1699 | }; |
1700 | ||
f600b690 JF |
1701 | static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog) |
1702 | { | |
1703 | unsigned long int max_sz = PAGE_SIZE - sizeof(struct padded_vnet_hdr); | |
1704 | struct virtnet_info *vi = netdev_priv(dev); | |
1705 | struct bpf_prog *old_prog; | |
672aafd5 JF |
1706 | u16 xdp_qp = 0, curr_qp; |
1707 | int i, err; | |
f600b690 JF |
1708 | |
1709 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) || | |
92502fe8 JW |
1710 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) || |
1711 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) || | |
1712 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO)) { | |
f600b690 JF |
1713 | netdev_warn(dev, "can't set XDP while host is implementing LRO, disable LRO first\n"); |
1714 | return -EOPNOTSUPP; | |
1715 | } | |
1716 | ||
1717 | if (vi->mergeable_rx_bufs && !vi->any_header_sg) { | |
1718 | netdev_warn(dev, "XDP expects header/data in single page, any_header_sg required\n"); | |
1719 | return -EINVAL; | |
1720 | } | |
1721 | ||
1722 | if (dev->mtu > max_sz) { | |
1723 | netdev_warn(dev, "XDP requires MTU less than %lu\n", max_sz); | |
1724 | return -EINVAL; | |
1725 | } | |
1726 | ||
672aafd5 JF |
1727 | curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs; |
1728 | if (prog) | |
1729 | xdp_qp = nr_cpu_ids; | |
1730 | ||
1731 | /* XDP requires extra queues for XDP_TX */ | |
1732 | if (curr_qp + xdp_qp > vi->max_queue_pairs) { | |
1733 | netdev_warn(dev, "request %i queues but max is %i\n", | |
1734 | curr_qp + xdp_qp, vi->max_queue_pairs); | |
1735 | return -ENOMEM; | |
1736 | } | |
1737 | ||
1738 | err = virtnet_set_queues(vi, curr_qp + xdp_qp); | |
1739 | if (err) { | |
1740 | dev_warn(&dev->dev, "XDP Device queue allocation failure.\n"); | |
1741 | return err; | |
1742 | } | |
1743 | ||
f600b690 JF |
1744 | if (prog) { |
1745 | prog = bpf_prog_add(prog, vi->max_queue_pairs - 1); | |
672aafd5 JF |
1746 | if (IS_ERR(prog)) { |
1747 | virtnet_set_queues(vi, curr_qp); | |
f600b690 | 1748 | return PTR_ERR(prog); |
672aafd5 | 1749 | } |
f600b690 JF |
1750 | } |
1751 | ||
672aafd5 JF |
1752 | vi->xdp_queue_pairs = xdp_qp; |
1753 | netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp); | |
1754 | ||
f600b690 JF |
1755 | for (i = 0; i < vi->max_queue_pairs; i++) { |
1756 | old_prog = rtnl_dereference(vi->rq[i].xdp_prog); | |
1757 | rcu_assign_pointer(vi->rq[i].xdp_prog, prog); | |
1758 | if (old_prog) | |
1759 | bpf_prog_put(old_prog); | |
1760 | } | |
1761 | ||
1762 | return 0; | |
1763 | } | |
1764 | ||
1765 | static bool virtnet_xdp_query(struct net_device *dev) | |
1766 | { | |
1767 | struct virtnet_info *vi = netdev_priv(dev); | |
1768 | int i; | |
1769 | ||
1770 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1771 | if (vi->rq[i].xdp_prog) | |
1772 | return true; | |
1773 | } | |
1774 | return false; | |
1775 | } | |
1776 | ||
1777 | static int virtnet_xdp(struct net_device *dev, struct netdev_xdp *xdp) | |
1778 | { | |
1779 | switch (xdp->command) { | |
1780 | case XDP_SETUP_PROG: | |
1781 | return virtnet_xdp_set(dev, xdp->prog); | |
1782 | case XDP_QUERY_PROG: | |
1783 | xdp->prog_attached = virtnet_xdp_query(dev); | |
1784 | return 0; | |
1785 | default: | |
1786 | return -EINVAL; | |
1787 | } | |
1788 | } | |
1789 | ||
76288b4e SH |
1790 | static const struct net_device_ops virtnet_netdev = { |
1791 | .ndo_open = virtnet_open, | |
1792 | .ndo_stop = virtnet_close, | |
1793 | .ndo_start_xmit = start_xmit, | |
1794 | .ndo_validate_addr = eth_validate_addr, | |
9c46f6d4 | 1795 | .ndo_set_mac_address = virtnet_set_mac_address, |
2af7698e | 1796 | .ndo_set_rx_mode = virtnet_set_rx_mode, |
3fa2a1df | 1797 | .ndo_get_stats64 = virtnet_stats, |
1824a989 AW |
1798 | .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, |
1799 | .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, | |
76288b4e SH |
1800 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1801 | .ndo_poll_controller = virtnet_netpoll, | |
1802 | #endif | |
91815639 JW |
1803 | #ifdef CONFIG_NET_RX_BUSY_POLL |
1804 | .ndo_busy_poll = virtnet_busy_poll, | |
1805 | #endif | |
f600b690 | 1806 | .ndo_xdp = virtnet_xdp, |
76288b4e SH |
1807 | }; |
1808 | ||
586d17c5 | 1809 | static void virtnet_config_changed_work(struct work_struct *work) |
9f4d26d0 | 1810 | { |
586d17c5 JW |
1811 | struct virtnet_info *vi = |
1812 | container_of(work, struct virtnet_info, config_work); | |
9f4d26d0 MM |
1813 | u16 v; |
1814 | ||
855e0c52 RR |
1815 | if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, |
1816 | struct virtio_net_config, status, &v) < 0) | |
507613bf | 1817 | return; |
586d17c5 JW |
1818 | |
1819 | if (v & VIRTIO_NET_S_ANNOUNCE) { | |
ee89bab1 | 1820 | netdev_notify_peers(vi->dev); |
586d17c5 JW |
1821 | virtnet_ack_link_announce(vi); |
1822 | } | |
9f4d26d0 MM |
1823 | |
1824 | /* Ignore unknown (future) status bits */ | |
1825 | v &= VIRTIO_NET_S_LINK_UP; | |
1826 | ||
1827 | if (vi->status == v) | |
507613bf | 1828 | return; |
9f4d26d0 MM |
1829 | |
1830 | vi->status = v; | |
1831 | ||
1832 | if (vi->status & VIRTIO_NET_S_LINK_UP) { | |
1833 | netif_carrier_on(vi->dev); | |
986a4f4d | 1834 | netif_tx_wake_all_queues(vi->dev); |
9f4d26d0 MM |
1835 | } else { |
1836 | netif_carrier_off(vi->dev); | |
986a4f4d | 1837 | netif_tx_stop_all_queues(vi->dev); |
9f4d26d0 MM |
1838 | } |
1839 | } | |
1840 | ||
1841 | static void virtnet_config_changed(struct virtio_device *vdev) | |
1842 | { | |
1843 | struct virtnet_info *vi = vdev->priv; | |
1844 | ||
3b07e9ca | 1845 | schedule_work(&vi->config_work); |
9f4d26d0 MM |
1846 | } |
1847 | ||
986a4f4d JW |
1848 | static void virtnet_free_queues(struct virtnet_info *vi) |
1849 | { | |
d4fb84ee AV |
1850 | int i; |
1851 | ||
ab3971b1 JW |
1852 | for (i = 0; i < vi->max_queue_pairs; i++) { |
1853 | napi_hash_del(&vi->rq[i].napi); | |
d4fb84ee | 1854 | netif_napi_del(&vi->rq[i].napi); |
ab3971b1 | 1855 | } |
d4fb84ee | 1856 | |
963abe5c ED |
1857 | /* We called napi_hash_del() before netif_napi_del(), |
1858 | * we need to respect an RCU grace period before freeing vi->rq | |
1859 | */ | |
1860 | synchronize_net(); | |
1861 | ||
986a4f4d JW |
1862 | kfree(vi->rq); |
1863 | kfree(vi->sq); | |
1864 | } | |
1865 | ||
1866 | static void free_receive_bufs(struct virtnet_info *vi) | |
1867 | { | |
f600b690 | 1868 | struct bpf_prog *old_prog; |
986a4f4d JW |
1869 | int i; |
1870 | ||
f600b690 | 1871 | rtnl_lock(); |
986a4f4d JW |
1872 | for (i = 0; i < vi->max_queue_pairs; i++) { |
1873 | while (vi->rq[i].pages) | |
1874 | __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); | |
f600b690 JF |
1875 | |
1876 | old_prog = rtnl_dereference(vi->rq[i].xdp_prog); | |
1877 | RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL); | |
1878 | if (old_prog) | |
1879 | bpf_prog_put(old_prog); | |
986a4f4d | 1880 | } |
f600b690 | 1881 | rtnl_unlock(); |
986a4f4d JW |
1882 | } |
1883 | ||
fb51879d MD |
1884 | static void free_receive_page_frags(struct virtnet_info *vi) |
1885 | { | |
1886 | int i; | |
1887 | for (i = 0; i < vi->max_queue_pairs; i++) | |
1888 | if (vi->rq[i].alloc_frag.page) | |
1889 | put_page(vi->rq[i].alloc_frag.page); | |
1890 | } | |
1891 | ||
56434a01 JF |
1892 | static bool is_xdp_queue(struct virtnet_info *vi, int q) |
1893 | { | |
1894 | if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs)) | |
1895 | return false; | |
1896 | else if (q < vi->curr_queue_pairs) | |
1897 | return true; | |
1898 | else | |
1899 | return false; | |
1900 | } | |
1901 | ||
986a4f4d JW |
1902 | static void free_unused_bufs(struct virtnet_info *vi) |
1903 | { | |
1904 | void *buf; | |
1905 | int i; | |
1906 | ||
1907 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1908 | struct virtqueue *vq = vi->sq[i].vq; | |
56434a01 JF |
1909 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { |
1910 | if (!is_xdp_queue(vi, i)) | |
1911 | dev_kfree_skb(buf); | |
1912 | else | |
1913 | put_page(virt_to_head_page(buf)); | |
1914 | } | |
986a4f4d JW |
1915 | } |
1916 | ||
1917 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1918 | struct virtqueue *vq = vi->rq[i].vq; | |
1919 | ||
1920 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { | |
ab7db917 MD |
1921 | if (vi->mergeable_rx_bufs) { |
1922 | unsigned long ctx = (unsigned long)buf; | |
1923 | void *base = mergeable_ctx_to_buf_address(ctx); | |
1924 | put_page(virt_to_head_page(base)); | |
1925 | } else if (vi->big_packets) { | |
fa9fac17 | 1926 | give_pages(&vi->rq[i], buf); |
ab7db917 | 1927 | } else { |
986a4f4d | 1928 | dev_kfree_skb(buf); |
ab7db917 | 1929 | } |
986a4f4d | 1930 | } |
986a4f4d JW |
1931 | } |
1932 | } | |
1933 | ||
e9d7417b JW |
1934 | static void virtnet_del_vqs(struct virtnet_info *vi) |
1935 | { | |
1936 | struct virtio_device *vdev = vi->vdev; | |
1937 | ||
8898c21c | 1938 | virtnet_clean_affinity(vi, -1); |
986a4f4d | 1939 | |
e9d7417b | 1940 | vdev->config->del_vqs(vdev); |
986a4f4d JW |
1941 | |
1942 | virtnet_free_queues(vi); | |
e9d7417b JW |
1943 | } |
1944 | ||
986a4f4d | 1945 | static int virtnet_find_vqs(struct virtnet_info *vi) |
3f9c10b0 | 1946 | { |
986a4f4d JW |
1947 | vq_callback_t **callbacks; |
1948 | struct virtqueue **vqs; | |
1949 | int ret = -ENOMEM; | |
1950 | int i, total_vqs; | |
1951 | const char **names; | |
1952 | ||
1953 | /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by | |
1954 | * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by | |
1955 | * possible control vq. | |
1956 | */ | |
1957 | total_vqs = vi->max_queue_pairs * 2 + | |
1958 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); | |
1959 | ||
1960 | /* Allocate space for find_vqs parameters */ | |
1961 | vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL); | |
1962 | if (!vqs) | |
1963 | goto err_vq; | |
1964 | callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL); | |
1965 | if (!callbacks) | |
1966 | goto err_callback; | |
1967 | names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL); | |
1968 | if (!names) | |
1969 | goto err_names; | |
1970 | ||
1971 | /* Parameters for control virtqueue, if any */ | |
1972 | if (vi->has_cvq) { | |
1973 | callbacks[total_vqs - 1] = NULL; | |
1974 | names[total_vqs - 1] = "control"; | |
1975 | } | |
3f9c10b0 | 1976 | |
986a4f4d JW |
1977 | /* Allocate/initialize parameters for send/receive virtqueues */ |
1978 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1979 | callbacks[rxq2vq(i)] = skb_recv_done; | |
1980 | callbacks[txq2vq(i)] = skb_xmit_done; | |
1981 | sprintf(vi->rq[i].name, "input.%d", i); | |
1982 | sprintf(vi->sq[i].name, "output.%d", i); | |
1983 | names[rxq2vq(i)] = vi->rq[i].name; | |
1984 | names[txq2vq(i)] = vi->sq[i].name; | |
1985 | } | |
3f9c10b0 | 1986 | |
986a4f4d JW |
1987 | ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, |
1988 | names); | |
1989 | if (ret) | |
1990 | goto err_find; | |
3f9c10b0 | 1991 | |
986a4f4d JW |
1992 | if (vi->has_cvq) { |
1993 | vi->cvq = vqs[total_vqs - 1]; | |
3f9c10b0 | 1994 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) |
f646968f | 1995 | vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; |
3f9c10b0 | 1996 | } |
986a4f4d JW |
1997 | |
1998 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1999 | vi->rq[i].vq = vqs[rxq2vq(i)]; | |
2000 | vi->sq[i].vq = vqs[txq2vq(i)]; | |
2001 | } | |
2002 | ||
2003 | kfree(names); | |
2004 | kfree(callbacks); | |
2005 | kfree(vqs); | |
2006 | ||
3f9c10b0 | 2007 | return 0; |
986a4f4d JW |
2008 | |
2009 | err_find: | |
2010 | kfree(names); | |
2011 | err_names: | |
2012 | kfree(callbacks); | |
2013 | err_callback: | |
2014 | kfree(vqs); | |
2015 | err_vq: | |
2016 | return ret; | |
2017 | } | |
2018 | ||
2019 | static int virtnet_alloc_queues(struct virtnet_info *vi) | |
2020 | { | |
2021 | int i; | |
2022 | ||
2023 | vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL); | |
2024 | if (!vi->sq) | |
2025 | goto err_sq; | |
2026 | vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL); | |
008d4278 | 2027 | if (!vi->rq) |
986a4f4d JW |
2028 | goto err_rq; |
2029 | ||
2030 | INIT_DELAYED_WORK(&vi->refill, refill_work); | |
2031 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2032 | vi->rq[i].pages = NULL; | |
2033 | netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll, | |
2034 | napi_weight); | |
2035 | ||
2036 | sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); | |
5377d758 | 2037 | ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len); |
986a4f4d JW |
2038 | sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); |
2039 | } | |
2040 | ||
2041 | return 0; | |
2042 | ||
2043 | err_rq: | |
2044 | kfree(vi->sq); | |
2045 | err_sq: | |
2046 | return -ENOMEM; | |
2047 | } | |
2048 | ||
2049 | static int init_vqs(struct virtnet_info *vi) | |
2050 | { | |
2051 | int ret; | |
2052 | ||
2053 | /* Allocate send & receive queues */ | |
2054 | ret = virtnet_alloc_queues(vi); | |
2055 | if (ret) | |
2056 | goto err; | |
2057 | ||
2058 | ret = virtnet_find_vqs(vi); | |
2059 | if (ret) | |
2060 | goto err_free; | |
2061 | ||
47be2479 | 2062 | get_online_cpus(); |
8898c21c | 2063 | virtnet_set_affinity(vi); |
47be2479 WG |
2064 | put_online_cpus(); |
2065 | ||
986a4f4d JW |
2066 | return 0; |
2067 | ||
2068 | err_free: | |
2069 | virtnet_free_queues(vi); | |
2070 | err: | |
2071 | return ret; | |
3f9c10b0 AS |
2072 | } |
2073 | ||
fbf28d78 MD |
2074 | #ifdef CONFIG_SYSFS |
2075 | static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue, | |
2076 | struct rx_queue_attribute *attribute, char *buf) | |
2077 | { | |
2078 | struct virtnet_info *vi = netdev_priv(queue->dev); | |
2079 | unsigned int queue_index = get_netdev_rx_queue_index(queue); | |
5377d758 | 2080 | struct ewma_pkt_len *avg; |
fbf28d78 MD |
2081 | |
2082 | BUG_ON(queue_index >= vi->max_queue_pairs); | |
2083 | avg = &vi->rq[queue_index].mrg_avg_pkt_len; | |
2084 | return sprintf(buf, "%u\n", get_mergeable_buf_len(avg)); | |
2085 | } | |
2086 | ||
2087 | static struct rx_queue_attribute mergeable_rx_buffer_size_attribute = | |
2088 | __ATTR_RO(mergeable_rx_buffer_size); | |
2089 | ||
2090 | static struct attribute *virtio_net_mrg_rx_attrs[] = { | |
2091 | &mergeable_rx_buffer_size_attribute.attr, | |
2092 | NULL | |
2093 | }; | |
2094 | ||
2095 | static const struct attribute_group virtio_net_mrg_rx_group = { | |
2096 | .name = "virtio_net", | |
2097 | .attrs = virtio_net_mrg_rx_attrs | |
2098 | }; | |
2099 | #endif | |
2100 | ||
892d6eb1 JW |
2101 | static bool virtnet_fail_on_feature(struct virtio_device *vdev, |
2102 | unsigned int fbit, | |
2103 | const char *fname, const char *dname) | |
2104 | { | |
2105 | if (!virtio_has_feature(vdev, fbit)) | |
2106 | return false; | |
2107 | ||
2108 | dev_err(&vdev->dev, "device advertises feature %s but not %s", | |
2109 | fname, dname); | |
2110 | ||
2111 | return true; | |
2112 | } | |
2113 | ||
2114 | #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \ | |
2115 | virtnet_fail_on_feature(vdev, fbit, #fbit, dbit) | |
2116 | ||
2117 | static bool virtnet_validate_features(struct virtio_device *vdev) | |
2118 | { | |
2119 | if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && | |
2120 | (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, | |
2121 | "VIRTIO_NET_F_CTRL_VQ") || | |
2122 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, | |
2123 | "VIRTIO_NET_F_CTRL_VQ") || | |
2124 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, | |
2125 | "VIRTIO_NET_F_CTRL_VQ") || | |
2126 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || | |
2127 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, | |
2128 | "VIRTIO_NET_F_CTRL_VQ"))) { | |
2129 | return false; | |
2130 | } | |
2131 | ||
2132 | return true; | |
2133 | } | |
2134 | ||
d0c2c997 JW |
2135 | #define MIN_MTU ETH_MIN_MTU |
2136 | #define MAX_MTU ETH_MAX_MTU | |
2137 | ||
296f96fc RR |
2138 | static int virtnet_probe(struct virtio_device *vdev) |
2139 | { | |
986a4f4d | 2140 | int i, err; |
296f96fc RR |
2141 | struct net_device *dev; |
2142 | struct virtnet_info *vi; | |
986a4f4d | 2143 | u16 max_queue_pairs; |
14de9d11 | 2144 | int mtu; |
986a4f4d | 2145 | |
6ba42248 MT |
2146 | if (!vdev->config->get) { |
2147 | dev_err(&vdev->dev, "%s failure: config access disabled\n", | |
2148 | __func__); | |
2149 | return -EINVAL; | |
2150 | } | |
2151 | ||
892d6eb1 JW |
2152 | if (!virtnet_validate_features(vdev)) |
2153 | return -EINVAL; | |
2154 | ||
986a4f4d | 2155 | /* Find if host supports multiqueue virtio_net device */ |
855e0c52 RR |
2156 | err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ, |
2157 | struct virtio_net_config, | |
2158 | max_virtqueue_pairs, &max_queue_pairs); | |
986a4f4d JW |
2159 | |
2160 | /* We need at least 2 queue's */ | |
2161 | if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || | |
2162 | max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || | |
2163 | !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) | |
2164 | max_queue_pairs = 1; | |
296f96fc RR |
2165 | |
2166 | /* Allocate ourselves a network device with room for our info */ | |
986a4f4d | 2167 | dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); |
296f96fc RR |
2168 | if (!dev) |
2169 | return -ENOMEM; | |
2170 | ||
2171 | /* Set up network device as normal. */ | |
f2f2c8b4 | 2172 | dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; |
76288b4e | 2173 | dev->netdev_ops = &virtnet_netdev; |
296f96fc | 2174 | dev->features = NETIF_F_HIGHDMA; |
3fa2a1df | 2175 | |
7ad24ea4 | 2176 | dev->ethtool_ops = &virtnet_ethtool_ops; |
296f96fc RR |
2177 | SET_NETDEV_DEV(dev, &vdev->dev); |
2178 | ||
2179 | /* Do we support "hardware" checksums? */ | |
98e778c9 | 2180 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc | 2181 | /* This opens up the world of extra features. */ |
48900cb6 | 2182 | dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG; |
98e778c9 | 2183 | if (csum) |
48900cb6 | 2184 | dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG; |
98e778c9 MM |
2185 | |
2186 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { | |
e3e3c423 | 2187 | dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO |
34a48579 RR |
2188 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; |
2189 | } | |
5539ae96 | 2190 | /* Individual feature bits: what can host handle? */ |
98e778c9 MM |
2191 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
2192 | dev->hw_features |= NETIF_F_TSO; | |
2193 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) | |
2194 | dev->hw_features |= NETIF_F_TSO6; | |
2195 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) | |
2196 | dev->hw_features |= NETIF_F_TSO_ECN; | |
e3e3c423 VY |
2197 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) |
2198 | dev->hw_features |= NETIF_F_UFO; | |
98e778c9 | 2199 | |
41f2f127 JW |
2200 | dev->features |= NETIF_F_GSO_ROBUST; |
2201 | ||
98e778c9 | 2202 | if (gso) |
e3e3c423 | 2203 | dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO); |
98e778c9 | 2204 | /* (!csum && gso) case will be fixed by register_netdev() */ |
296f96fc | 2205 | } |
4f49129b TH |
2206 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) |
2207 | dev->features |= NETIF_F_RXCSUM; | |
296f96fc | 2208 | |
4fda8302 JW |
2209 | dev->vlan_features = dev->features; |
2210 | ||
d0c2c997 JW |
2211 | /* MTU range: 68 - 65535 */ |
2212 | dev->min_mtu = MIN_MTU; | |
2213 | dev->max_mtu = MAX_MTU; | |
2214 | ||
296f96fc | 2215 | /* Configuration may specify what MAC to use. Otherwise random. */ |
855e0c52 RR |
2216 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) |
2217 | virtio_cread_bytes(vdev, | |
2218 | offsetof(struct virtio_net_config, mac), | |
2219 | dev->dev_addr, dev->addr_len); | |
2220 | else | |
f2cedb63 | 2221 | eth_hw_addr_random(dev); |
296f96fc RR |
2222 | |
2223 | /* Set up our device-specific information */ | |
2224 | vi = netdev_priv(dev); | |
296f96fc RR |
2225 | vi->dev = dev; |
2226 | vi->vdev = vdev; | |
d9d5dcc8 | 2227 | vdev->priv = vi; |
3fa2a1df | 2228 | vi->stats = alloc_percpu(struct virtnet_stats); |
2229 | err = -ENOMEM; | |
2230 | if (vi->stats == NULL) | |
2231 | goto free; | |
2232 | ||
827da44c JS |
2233 | for_each_possible_cpu(i) { |
2234 | struct virtnet_stats *virtnet_stats; | |
2235 | virtnet_stats = per_cpu_ptr(vi->stats, i); | |
2236 | u64_stats_init(&virtnet_stats->tx_syncp); | |
2237 | u64_stats_init(&virtnet_stats->rx_syncp); | |
2238 | } | |
2239 | ||
586d17c5 | 2240 | INIT_WORK(&vi->config_work, virtnet_config_changed_work); |
296f96fc | 2241 | |
97402b96 | 2242 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
8e95a202 JP |
2243 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || |
2244 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || | |
e3e3c423 VY |
2245 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) || |
2246 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO)) | |
97402b96 HX |
2247 | vi->big_packets = true; |
2248 | ||
3f2c31d9 MM |
2249 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) |
2250 | vi->mergeable_rx_bufs = true; | |
2251 | ||
d04302b3 MT |
2252 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) || |
2253 | virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) | |
012873d0 MT |
2254 | vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); |
2255 | else | |
2256 | vi->hdr_len = sizeof(struct virtio_net_hdr); | |
2257 | ||
75993300 MT |
2258 | if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) || |
2259 | virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) | |
e7428e95 MT |
2260 | vi->any_header_sg = true; |
2261 | ||
986a4f4d JW |
2262 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) |
2263 | vi->has_cvq = true; | |
2264 | ||
14de9d11 AC |
2265 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { |
2266 | mtu = virtio_cread16(vdev, | |
2267 | offsetof(struct virtio_net_config, | |
2268 | mtu)); | |
93a205ee | 2269 | if (mtu < dev->min_mtu) { |
14de9d11 | 2270 | __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU); |
93a205ee | 2271 | } else { |
d0c2c997 | 2272 | dev->mtu = mtu; |
93a205ee AC |
2273 | dev->max_mtu = mtu; |
2274 | } | |
14de9d11 AC |
2275 | } |
2276 | ||
012873d0 MT |
2277 | if (vi->any_header_sg) |
2278 | dev->needed_headroom = vi->hdr_len; | |
6ebbc1a6 | 2279 | |
44900010 JW |
2280 | /* Enable multiqueue by default */ |
2281 | if (num_online_cpus() >= max_queue_pairs) | |
2282 | vi->curr_queue_pairs = max_queue_pairs; | |
2283 | else | |
2284 | vi->curr_queue_pairs = num_online_cpus(); | |
986a4f4d JW |
2285 | vi->max_queue_pairs = max_queue_pairs; |
2286 | ||
2287 | /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ | |
3f9c10b0 | 2288 | err = init_vqs(vi); |
d2a7ddda | 2289 | if (err) |
9bb8ca86 | 2290 | goto free_stats; |
296f96fc | 2291 | |
fbf28d78 MD |
2292 | #ifdef CONFIG_SYSFS |
2293 | if (vi->mergeable_rx_bufs) | |
2294 | dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; | |
2295 | #endif | |
0f13b66b ZYW |
2296 | netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); |
2297 | netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); | |
986a4f4d | 2298 | |
16032be5 NA |
2299 | virtnet_init_settings(dev); |
2300 | ||
296f96fc RR |
2301 | err = register_netdev(dev); |
2302 | if (err) { | |
2303 | pr_debug("virtio_net: registering device failed\n"); | |
d2a7ddda | 2304 | goto free_vqs; |
296f96fc | 2305 | } |
b3369c1f | 2306 | |
4baf1e33 MT |
2307 | virtio_device_ready(vdev); |
2308 | ||
8017c279 | 2309 | err = virtnet_cpu_notif_add(vi); |
8de4b2f3 WG |
2310 | if (err) { |
2311 | pr_debug("virtio_net: registering cpu notifier failed\n"); | |
f00e35e2 | 2312 | goto free_unregister_netdev; |
8de4b2f3 WG |
2313 | } |
2314 | ||
a220871b JW |
2315 | rtnl_lock(); |
2316 | virtnet_set_queues(vi, vi->curr_queue_pairs); | |
2317 | rtnl_unlock(); | |
44900010 | 2318 | |
167c25e4 JW |
2319 | /* Assume link up if device can't report link status, |
2320 | otherwise get link status from config. */ | |
2321 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { | |
2322 | netif_carrier_off(dev); | |
3b07e9ca | 2323 | schedule_work(&vi->config_work); |
167c25e4 JW |
2324 | } else { |
2325 | vi->status = VIRTIO_NET_S_LINK_UP; | |
2326 | netif_carrier_on(dev); | |
2327 | } | |
9f4d26d0 | 2328 | |
986a4f4d JW |
2329 | pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", |
2330 | dev->name, max_queue_pairs); | |
2331 | ||
296f96fc RR |
2332 | return 0; |
2333 | ||
f00e35e2 | 2334 | free_unregister_netdev: |
02465555 MT |
2335 | vi->vdev->config->reset(vdev); |
2336 | ||
b3369c1f | 2337 | unregister_netdev(dev); |
d2a7ddda | 2338 | free_vqs: |
986a4f4d | 2339 | cancel_delayed_work_sync(&vi->refill); |
fb51879d | 2340 | free_receive_page_frags(vi); |
e9d7417b | 2341 | virtnet_del_vqs(vi); |
3fa2a1df | 2342 | free_stats: |
2343 | free_percpu(vi->stats); | |
296f96fc RR |
2344 | free: |
2345 | free_netdev(dev); | |
2346 | return err; | |
2347 | } | |
2348 | ||
04486ed0 | 2349 | static void remove_vq_common(struct virtnet_info *vi) |
296f96fc | 2350 | { |
04486ed0 | 2351 | vi->vdev->config->reset(vi->vdev); |
830a8a97 SM |
2352 | |
2353 | /* Free unused buffers in both send and recv, if any. */ | |
9ab86bbc | 2354 | free_unused_bufs(vi); |
fb6813f4 | 2355 | |
986a4f4d | 2356 | free_receive_bufs(vi); |
d2a7ddda | 2357 | |
fb51879d MD |
2358 | free_receive_page_frags(vi); |
2359 | ||
986a4f4d | 2360 | virtnet_del_vqs(vi); |
04486ed0 AS |
2361 | } |
2362 | ||
8cc085d6 | 2363 | static void virtnet_remove(struct virtio_device *vdev) |
04486ed0 AS |
2364 | { |
2365 | struct virtnet_info *vi = vdev->priv; | |
2366 | ||
8017c279 | 2367 | virtnet_cpu_notif_remove(vi); |
8de4b2f3 | 2368 | |
102a2786 MT |
2369 | /* Make sure no work handler is accessing the device. */ |
2370 | flush_work(&vi->config_work); | |
586d17c5 | 2371 | |
04486ed0 AS |
2372 | unregister_netdev(vi->dev); |
2373 | ||
2374 | remove_vq_common(vi); | |
fb6813f4 | 2375 | |
2e66f55b | 2376 | free_percpu(vi->stats); |
74b2553f | 2377 | free_netdev(vi->dev); |
296f96fc RR |
2378 | } |
2379 | ||
89107000 | 2380 | #ifdef CONFIG_PM_SLEEP |
0741bcb5 AS |
2381 | static int virtnet_freeze(struct virtio_device *vdev) |
2382 | { | |
2383 | struct virtnet_info *vi = vdev->priv; | |
986a4f4d | 2384 | int i; |
0741bcb5 | 2385 | |
8017c279 | 2386 | virtnet_cpu_notif_remove(vi); |
ec9debbd | 2387 | |
102a2786 MT |
2388 | /* Make sure no work handler is accessing the device */ |
2389 | flush_work(&vi->config_work); | |
586d17c5 | 2390 | |
0741bcb5 AS |
2391 | netif_device_detach(vi->dev); |
2392 | cancel_delayed_work_sync(&vi->refill); | |
2393 | ||
91815639 | 2394 | if (netif_running(vi->dev)) { |
ab3971b1 | 2395 | for (i = 0; i < vi->max_queue_pairs; i++) |
986a4f4d | 2396 | napi_disable(&vi->rq[i].napi); |
91815639 | 2397 | } |
0741bcb5 AS |
2398 | |
2399 | remove_vq_common(vi); | |
2400 | ||
2401 | return 0; | |
2402 | } | |
2403 | ||
2404 | static int virtnet_restore(struct virtio_device *vdev) | |
2405 | { | |
2406 | struct virtnet_info *vi = vdev->priv; | |
986a4f4d | 2407 | int err, i; |
0741bcb5 AS |
2408 | |
2409 | err = init_vqs(vi); | |
2410 | if (err) | |
2411 | return err; | |
2412 | ||
e53fbd11 MT |
2413 | virtio_device_ready(vdev); |
2414 | ||
6cd4ce00 JW |
2415 | if (netif_running(vi->dev)) { |
2416 | for (i = 0; i < vi->curr_queue_pairs; i++) | |
946fa564 | 2417 | if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) |
6cd4ce00 JW |
2418 | schedule_delayed_work(&vi->refill, 0); |
2419 | ||
986a4f4d JW |
2420 | for (i = 0; i < vi->max_queue_pairs; i++) |
2421 | virtnet_napi_enable(&vi->rq[i]); | |
6cd4ce00 | 2422 | } |
0741bcb5 AS |
2423 | |
2424 | netif_device_attach(vi->dev); | |
2425 | ||
35ed159b | 2426 | rtnl_lock(); |
986a4f4d | 2427 | virtnet_set_queues(vi, vi->curr_queue_pairs); |
35ed159b | 2428 | rtnl_unlock(); |
986a4f4d | 2429 | |
8017c279 | 2430 | err = virtnet_cpu_notif_add(vi); |
ec9debbd JW |
2431 | if (err) |
2432 | return err; | |
2433 | ||
0741bcb5 AS |
2434 | return 0; |
2435 | } | |
2436 | #endif | |
2437 | ||
296f96fc RR |
2438 | static struct virtio_device_id id_table[] = { |
2439 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
2440 | { 0 }, | |
2441 | }; | |
2442 | ||
f3358507 MT |
2443 | #define VIRTNET_FEATURES \ |
2444 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \ | |
2445 | VIRTIO_NET_F_MAC, \ | |
2446 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \ | |
2447 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \ | |
2448 | VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \ | |
2449 | VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \ | |
2450 | VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \ | |
2451 | VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \ | |
2452 | VIRTIO_NET_F_CTRL_MAC_ADDR, \ | |
2453 | VIRTIO_NET_F_MTU | |
2454 | ||
c45a6816 | 2455 | static unsigned int features[] = { |
f3358507 MT |
2456 | VIRTNET_FEATURES, |
2457 | }; | |
2458 | ||
2459 | static unsigned int features_legacy[] = { | |
2460 | VIRTNET_FEATURES, | |
2461 | VIRTIO_NET_F_GSO, | |
e7428e95 | 2462 | VIRTIO_F_ANY_LAYOUT, |
c45a6816 RR |
2463 | }; |
2464 | ||
22402529 | 2465 | static struct virtio_driver virtio_net_driver = { |
c45a6816 RR |
2466 | .feature_table = features, |
2467 | .feature_table_size = ARRAY_SIZE(features), | |
f3358507 MT |
2468 | .feature_table_legacy = features_legacy, |
2469 | .feature_table_size_legacy = ARRAY_SIZE(features_legacy), | |
296f96fc RR |
2470 | .driver.name = KBUILD_MODNAME, |
2471 | .driver.owner = THIS_MODULE, | |
2472 | .id_table = id_table, | |
2473 | .probe = virtnet_probe, | |
8cc085d6 | 2474 | .remove = virtnet_remove, |
9f4d26d0 | 2475 | .config_changed = virtnet_config_changed, |
89107000 | 2476 | #ifdef CONFIG_PM_SLEEP |
0741bcb5 AS |
2477 | .freeze = virtnet_freeze, |
2478 | .restore = virtnet_restore, | |
2479 | #endif | |
296f96fc RR |
2480 | }; |
2481 | ||
8017c279 SAS |
2482 | static __init int virtio_net_driver_init(void) |
2483 | { | |
2484 | int ret; | |
2485 | ||
73c1b41e | 2486 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "virtio/net:online", |
8017c279 SAS |
2487 | virtnet_cpu_online, |
2488 | virtnet_cpu_down_prep); | |
2489 | if (ret < 0) | |
2490 | goto out; | |
2491 | virtionet_online = ret; | |
73c1b41e | 2492 | ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "virtio/net:dead", |
8017c279 SAS |
2493 | NULL, virtnet_cpu_dead); |
2494 | if (ret) | |
2495 | goto err_dead; | |
2496 | ||
2497 | ret = register_virtio_driver(&virtio_net_driver); | |
2498 | if (ret) | |
2499 | goto err_virtio; | |
2500 | return 0; | |
2501 | err_virtio: | |
2502 | cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); | |
2503 | err_dead: | |
2504 | cpuhp_remove_multi_state(virtionet_online); | |
2505 | out: | |
2506 | return ret; | |
2507 | } | |
2508 | module_init(virtio_net_driver_init); | |
2509 | ||
2510 | static __exit void virtio_net_driver_exit(void) | |
2511 | { | |
2512 | cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); | |
2513 | cpuhp_remove_multi_state(virtionet_online); | |
2514 | unregister_virtio_driver(&virtio_net_driver); | |
2515 | } | |
2516 | module_exit(virtio_net_driver_exit); | |
296f96fc RR |
2517 | |
2518 | MODULE_DEVICE_TABLE(virtio, id_table); | |
2519 | MODULE_DESCRIPTION("Virtio network driver"); | |
2520 | MODULE_LICENSE("GPL"); |